This egg white frittata bakes up light and tender with colorful vegetables, herbs, and plenty of fresh flavor for an easy breakfast or brunch!

If breakfast needs to be light, protein-packed, colorful, and genuinely worth getting out of bed for, this egg white frittata earns a permanent spot in your morning rotation!

Ingredients

• 2 teaspoons extra-virgin olive oil, plus a little more for greasing skillet if needed
• 1/2 medium yellow onion, finely diced, about 1/2 cup
• 1 medium red bell pepper, diced small, about 3/4 cup
• 2 packed cups baby spinach, roughly chopped
• 2 garlic cloves, finely minced
• 2 cups liquid egg whites, about 16 large egg whites
• 1/4 cup 2% milk
• 1/4 cup finely grated Parmesan cheese
• 1/2 teaspoon kosher salt, or slightly less if your feta is particularly salty
• 1/4 teaspoon freshly ground black pepper
• 1/4 teaspoon smoked paprika
• 1/3 cup crumbled feta cheese
• 2 tablespoons sliced green onions or chopped fresh chives, for finishing

Servings: 6

How to Make Egg White Frittata

Heat oven to 375°F and position a rack in center. Use a 10-inch oven-safe skillet if you have one because that size gives egg mixture enough depth to stay tender while still cooking through fairly quickly.

A 12-inch skillet technically works, but your frittata will be thinner and can go from tender to overcooked surprisingly fast, so I would choose 10 inches whenever possible.

Set skillet over medium heat, add olive oil, and let it warm for roughly 30 seconds. You want oil loose and shimmering but nowhere near smoking.

Add diced onion and red bell pepper with a tiny pinch of salt, then cook for 5 to 6 minutes, stirring occasionally rather than constantly.

Giving vegetables a little uninterrupted contact with hot skillet helps onion become sweet and translucent while pepper softens and develops those lightly browned edges that make breakfast smell considerably more exciting!

When peppers have softened but still hold their shape, add chopped spinach. It will initially look like far too much spinach, as spinach enjoys being dramatic for approximately 45 seconds, then collapses into a perfectly reasonable amount.

Stir and cook for 1 to 2 minutes, until leaves are completely wilted and any obvious moisture in skillet has evaporated.

Add minced garlic and cook for only 30 seconds, stirring continuously. Garlic should smell fragrant almost immediately. If it begins turning dark brown, your heat is too high, so move skillet off burner briefly rather than hoping garlic will reconsider its life choices.

At this point, look carefully at skillet. If you see liquid collecting around vegetables, continue cooking for another minute. This tiny decision makes an enormous difference later because egg whites contain plenty of water already and do not need vegetables contributing another cup to proceedings.

While vegetables finish cooking, pour egg whites into a large bowl or measuring jug and add milk, Parmesan, salt, black pepper, and smoked paprika.

Whisk for about 30 seconds, just until mixture looks evenly combined and slightly frothy across surface. You are not trying to whip egg whites into peaks.

A little air is helpful; a breakfast soufflé situation is not required.

Reduce stovetop heat to medium-low, spread vegetables evenly across skillet, and pour egg white mixture over them slowly, moving around pan as you pour rather than dumping everything into center.

Gently use a silicone spatula to nudge any vegetable piles into empty spots, because nobody wants one slice containing every pepper while another gets assigned three lonely spinach leaves.

Sprinkle feta evenly over surface and press larger pieces very lightly into egg mixture. Keep skillet over medium-low heat for about 1 to 2 minutes, just until a very thin cooked edge begins forming around outside.

Center should still be completely liquid at this stage. This brief stovetop start gives bottom a head start so middle and edges finish closer to same time in oven.

Transfer skillet carefully to preheated 375°F oven and bake for 10 to 14 minutes. Start checking at 10 minutes, especially if your skillet retains heat aggressively.

A properly cooked frittata should look set around edges and mostly matte across top, while center may have the slightest gentle wobble when you carefully shake pan.

Do not wait until it looks dry and firm enough to bounce a quarter off it! Residual heat continues cooking eggs after skillet leaves oven, and that is exactly how you keep an egg white frittata tender.

If you prefer a little more color on top, switch broiler on and broil frittata for 30 to 60 seconds, watching it constantly.

This is optional, and I really do mean constantly because a broiler can spend 40 seconds appearing to accomplish nothing and then suddenly decide breakfast needs cremating.

For food-safety purposes, egg dishes should reach 160°F in center. If using an instant-read thermometer, insert it near middle without touching bottom of skillet.

Remove frittata from oven and let it rest for 5 minutes before slicing. That short rest helps egg structure settle, allows remaining steam to distribute, and gives feta a moment to soften beautifully.

Run a thin spatula around edge if needed, then cut into six wedges and scatter green onions or chives over top.

Take a look at your first slice. Interior should be tender and evenly studded with vegetables, not wet at bottom, while feta should remain in small creamy pockets rather than disappearing completely. That is exactly what you want!

Serving Suggestions

• For a light breakfast, serve one wedge with fresh berries, melon, orange slices, or sliced tomatoes dressed with a little salt and pepper.
• For a more substantial breakfast or brunch, pair it with crispy roasted breakfast potatoes, sourdough toast, an English muffin, avocado toast, or a simple arugula salad with lemon.
• You can also tuck a warm wedge inside a toasted English muffin with avocado and hot sauce for a very good breakfast sandwich, or wrap a slice inside a warm tortilla with salsa for an easy breakfast taco situation.
• If you are serving several people at brunch, I would put out sliced avocado, cherry tomatoes, fruit, toasted bread, salsa, and hot sauce and let everyone finish their own plate. It looks impressive while requiring almost no additional cooking, which is my preferred category of impressive!

Tender in center, lightly golden around edges, salty from feta, sweet from peppers, fresh with spinach, and ready in around half an hour, this egg white frittata is exactly what I want from a make-ahead breakfast: plenty of flavor, plenty of vegetables, and none of that dry, squeaky egg-white texture that gives healthy breakfasts a bad reputation! 

Hungry for more feel-good meals? Explore these 21 Anti-Inflammatory Breakfast Recipes for a nourishing start and 10 Anti-Inflammatory Dinner Recipes for delicious evenings that make healthy eating easy!