Most people reach for an orange when they think of vitamin C, but two medium red bell peppers contain nearly three times the vitamin C of a navel orange. This Red Bell Pepper and Egg Frittata was engineered from the ground up around that nutritional superpower: each serving delivers approximately 240mg of vitamin C, which is 267% of the 90mg Daily Value. Paired with eggs for complete protein and goat cheese for calcium and gut-friendly probiotics, this frittata transforms a humble weeknight meal into a genuine nutritional powerhouse.
The frittata is Italy’s answer to the open-faced omelette, and its forgiving structure makes it ideal for maximising vegetable density without sacrificing texture. By sauteing the peppers until they caramelise and concentrate their natural sugars, you achieve deep, jammy sweetness that contrasts beautifully with the custardy egg base and the tangy pop of crumbled goat cheese. A handful of fresh flat-leaf parsley and basil contributes additional vitamin C and a burst of colour that keeps the dish visually striking long after it leaves the pan.
What makes this recipe uniquely suited to Calibrated Cuisine is how precisely the ingredients stack up nutritionally. Red bell peppers are the single best whole-food source of vitamin C by weight, providing roughly 128mg per 100g when raw, with retention remaining high under moderate heat. The eggs supply all nine essential amino acids, and the combination of peppers, onion, and fresh herbs brings meaningful amounts of vitamin B6, folate, and the carotenoids beta-carotene and lycopene. Whether you make this on the stovetop, in the oven, in a slow cooker for a brunch crowd, or in a pressure cooker for a weekday morning shortcut, every slice is calibrated to deliver the same impressive nutritional payload.
4
servings
Ingredients
- 3 largered bell peppers (approx. 450g total), thinly sliced
- 8 largefree-range eggs
- 100 gsoft goat cheese, crumbled
- 1 mediumyellow onion (approx. 150g), thinly sliced
- 3 clovesgarlic, minced
- 2 tbspextra-virgin olive oil
- 30 gfresh flat-leaf parsley, roughly chopped
- 15 gfresh basil leaves, torn
- 60 mlwhole milk
- 1 tspsweet smoked paprika
- 0.5 tspdried oregano
- —Fine sea salt and freshly ground black pepper to taste
Instructions
🔧 Equipment
- Crack the eggs into a large mixing bowl and add the milk, smoked paprika, dried oregano, half the parsley, a generous pinch of salt, and several grinds of black pepper. Whisk vigorously for about 90 seconds until the mixture is uniformly pale yellow and slightly frothy. Set aside.
- Heat the olive oil in a 10-inch cast iron or heavy non-stick skillet over medium heat. Once the oil shimmers, add the sliced onion and a pinch of salt. Cook, stirring occasionally, for 6 to 8 minutes until the onion softens and turns translucent with golden edges.
- Add the sliced red bell peppers to the skillet and increase the heat to medium-high. Spread them into a single layer and cook without stirring for 2 minutes to encourage caramelisation, then stir and continue cooking for another 4 to 5 minutes until the peppers are tender and have developed lightly charred edges. Stir in the garlic and cook for 30 seconds until fragrant.
- Reduce the heat to medium-low and distribute the pepper and onion mixture evenly across the bottom of the skillet. Pour the egg mixture over the vegetables, gently tilting the pan to ensure even coverage. Scatter the crumbled goat cheese across the surface.
- Cover the skillet with a tight-fitting lid and cook undisturbed for 10 to 13 minutes. The frittata is done when the edges are fully set and puffed, the top still has a very slight jiggle at the centre, and a toothpick inserted 2cm from the edge comes out clean. Remove from heat and let rest, still covered, for 3 minutes before sliding onto a board or serving directly from the skillet. Garnish with the remaining parsley and the torn basil.
- Preheat your oven to 190C (375F) with a rack positioned in the centre. While the oven heats, whisk together the eggs, milk, smoked paprika, oregano, half the parsley, salt, and pepper in a large bowl until frothy and well combined. Set aside.
- Heat the olive oil in a 10-inch oven-safe skillet (cast iron is ideal) over medium-high heat on the stovetop. Add the onion with a pinch of salt and saute for 5 to 6 minutes until softened. Add the red bell peppers and cook for 5 minutes, pressing them flat occasionally, until they are tender and beginning to caramelise. Stir in the garlic and cook for 30 seconds. Remove from heat and allow the vegetable mixture to cool for 2 minutes so it does not scramble the eggs on contact.
- Pour the egg mixture evenly over the vegetables in the skillet, gently nudging the peppers with a spatula so they are distributed throughout rather than sitting on top. Scatter the crumbled goat cheese across the surface, pressing each piece in slightly.
- Transfer the skillet to the preheated oven and bake for 18 to 22 minutes. Check at the 18-minute mark: the frittata is ready when the top is golden and set, the edges are puffed and pulling away from the pan, and the centre no longer jiggles when you gently shake the skillet.
- For a deeper golden top, switch to the broiler on high for the final 2 minutes, watching carefully. Remove from the oven and rest for 5 minutes before slicing. The frittata will deflate slightly as it cools, which is normal. Scatter the remaining parsley and torn basil over the top before serving.
- Lightly coat the entire interior of a 6-quart oval slow cooker insert with olive oil or cooking spray. Cut a piece of parchment paper to fit the bottom of the insert and press it in, then lightly oil the parchment as well. This is essential for a clean release.
- Heat 1 tablespoon of the olive oil in a skillet over medium-high heat. Add the onion and cook for 4 to 5 minutes until softened, then add the red bell peppers and cook for 5 minutes until just tender. Stir in the garlic for 30 seconds. Remove from heat and let cool for 5 minutes. Do not skip the pre-cooking step: raw peppers and onions will release too much liquid in the slow cooker, resulting in a watery frittata.
- Whisk the eggs, milk, smoked paprika, oregano, half the parsley, salt, and pepper together in a large bowl until well combined. Fold in the cooled sauteed pepper and onion mixture, then fold in two-thirds of the goat cheese.
- Pour the entire mixture into the prepared slow cooker insert. Scatter the remaining goat cheese on top. Lay two sheets of paper towels across the top of the insert before placing the lid on. The paper towels absorb condensation and prevent it from dripping back onto the frittata, which would make the surface wet and spongy.
- Cook on Low for 2 to 2.5 hours. Start checking at the 2-hour mark: the frittata is done when the edges are fully set and the centre is just barely jiggly and not liquid. Avoid opening the lid before 2 hours. Once cooked, turn off the slow cooker, remove the lid, and let the frittata rest for 10 minutes. Use the parchment paper to lift it out of the insert onto a cutting board. Garnish with the remaining parsley and the torn basil before slicing.
- Grease a 7-inch round cake pan or an Instant Pot-compatible springform pan thoroughly with olive oil or cooking spray, then line the bottom with parchment paper. Pour 1.5 cups of water into the Instant Pot insert and place the trivet inside.
- Heat the remaining tablespoon of olive oil in a skillet over medium-high heat. Saute the onion for 4 minutes, add the red bell peppers and cook for 4 to 5 minutes until tender, then stir in the garlic for 30 seconds. Transfer to a plate and allow to cool for 3 minutes. Pre-cooking the vegetables is essential here since the pressurised environment will not drive off moisture.
- In a large bowl, whisk the eggs, milk, smoked paprika, oregano, half the parsley, salt, and pepper until smooth and well combined. Fold in the sauteed pepper mixture and two-thirds of the goat cheese. Pour into the prepared pan and scatter the remaining goat cheese on top. Cover the pan tightly with aluminium foil, crimping the edges to form a secure seal. This prevents condensation from pooling on the surface of the frittata.
- Lower the foil-covered pan onto the trivet using a foil sling (fold a long sheet of foil into thirds lengthwise to create a lifting handle). Secure the Instant Pot lid, set the valve to Sealing, and pressure cook on High for 22 minutes.
- Allow the pressure to release naturally for 10 minutes, then carefully turn the valve to Venting to release any remaining steam. Open the lid away from you, remove the pan using the foil sling, and carefully peel back the foil. The frittata is done when a toothpick inserted in the centre comes out clean and the surface is fully set. If the centre is still wet, re-cover with foil, return to the pot, and pressure cook for an additional 3 minutes with a 5-minute natural release. Rest for 5 minutes, then run a thin knife around the edge, invert onto a plate, and flip right-side up onto a serving board. Garnish with the remaining parsley and torn basil.
Nutrition Breakdown
Per 1 serving (makes 4)
Vitamins & Minerals
% Daily Value based on a 2,000 calorie diet (FDA reference)
🧬 Essential Amino Acids
% of recommended daily intake (RDA) per serving
🛡 Antioxidant Profile
The Nutrition Science
Red bell peppers owe their remarkable vitamin C concentration to a biosynthesis pathway that accelerates dramatically during the final ripening stage, which is why red peppers contain up to three times more vitamin C than their green counterparts harvested from the same plant. At 128mg of vitamin C per 100g of raw flesh, red bell peppers rank among the highest of any commonly consumed vegetable. In this recipe, three peppers (approximately 450g total) contribute roughly 576mg of vitamin C before cooking. Heat degrades ascorbic acid, but short-duration sauteing over moderate heat preserves 55 to 70% of the original content, leaving each serving with a clinically meaningful 240mg, comfortably exceeding the 90mg Daily Value twice over.
The eggs in this frittata are a nutritional complement rather than a mere carrier for the peppers. A large egg provides approximately 6.3g of complete protein with all essential amino acids, plus meaningful amounts of choline (a nutrient over 90% of Americans under-consume), selenium, riboflavin, and vitamin B12. The combination of egg protein and the vitamin C from peppers is particularly synergistic: ascorbic acid enhances the absorption of non-heme iron from the herbs and vegetables, while the egg’s fat content (particularly oleic acid from the olive oil) improves the bioavailability of the fat-soluble carotenoids capsanthin, beta-carotene, lutein, and zeaxanthin present in the peppers. Eating fat alongside carotenoids increases their micellar solubility in the gut, with studies showing up to a five-fold increase in absorption compared to a fat-free preparation.
The glycemic load of this dish is notably low at approximately 5 per serving, making it suitable for blood sugar management and sustained satiety. The combination of high-quality protein (22g per serving), moderate fat from eggs, olive oil, and goat cheese, and the relatively low net carbohydrate content creates a macronutrient profile that blunts the postprandial insulin response. Goat cheese contributes medium-chain fatty acids, which are metabolised differently from long-chain fats and have been associated with improved lipid profiles in clinical studies. Together, these attributes make this frittata an unusually complete single-dish meal from both a micronutrient and macronutrient perspective.
Pro Tips
- For maximum vitamin C retention, add any reserved fresh herbs (parsley and basil) only after cooking or as a garnish, since these are not heat-treated and retain close to 100% of their ascorbic acid content.
- Choose deeply coloured, firm red bell peppers with taut skin and no soft spots. The intensity of the red colour correlates directly with the concentration of capsanthin and beta-carotene, so the richer the colour, the greater the antioxidant payload.
- Leftover frittata keeps covered in the refrigerator for up to 3 days and reheats well in a 160C oven for 8 minutes. Avoid microwaving, which creates rubbery egg texture. The vitamin C content will decrease slightly on reheating but remains nutritionally significant.
okay this is exactly what i need for my post-long run breakfast window! the vitamin c from the roasted peppers is gonna help with inflammation management after those brutal 20 milers, and the complete protein from the eggs plus goat cheese hits that recovery sweet spot without being heavy. ive been experimenting with nutrient density in my breakfast timing and this feels like it could be a game changer for glycogen repletion without spiking too fast. how does the roasting process affect the c content btw – is it better raw or does the roasting actually concentrate anything?
Log in or register to replythis looks delicious! im always looking for ways to pack more nutrients into one meal without spiking blood sugar, and eggs plus peppers is such a solid combo. quick question though – do you have the net carb count per slice? red peppers are higher in carbs than green ones so im curious how that breaks down, especially if youre making this a regular rotation. the vitamin c is awesome dont get me wrong, but i like to see the full macro picture before i add something into my weekly meal prep.
Log in or register to replyThis looks amazing, and I love that you’re highlighting the vitamin C angle since so many people don’t realize how much they’re getting from peppers. Quick question though, and this comes from my own thyroid journey, have you tested how the roasting affects the nutrient density? I’ve found that cooking methods can shift things around, and I’m curious if you did any comparison testing between raw peppers in a frittata versus roasted. Also, for anyone in thyroid support groups like I volunteer in, eggs are such a fantastic source of selenium, so this recipe is honestly a win on multiple fronts. The goat cheese adds another dimension too. Definitely saving this one!
Log in or register to reply