Fluffy Egg-White Frittata With Vegetables

The edges of a good frittata should look softly set while the center stays tender and fluffy. This Fluffy Egg-White Frittata With Vegetables combines savory mushrooms, fresh spinach, feta, and Parmesan in a light egg-white base for an easy breakfast or brunch.

The vegetables are cooked before the eggs are added, which helps release excess moisture and gives the frittata a better texture. It goes from mixing bowl to table in about 25 minutes and makes 8 slices, making it just as useful for a weekend brunch as it is for a simple make-ahead breakfast.

Why You’ll Love This Recipe

• Ready in about 25 minutes from start to finish.
• Makes 8 slices, with 2 slices per serving.
• Mushrooms and spinach add vegetables while keeping the frittata light.
• Feta and Parmesan bring savory richness to the egg-white base.
• A short stovetop start followed by an 8–10 minute bake helps the eggs set without prolonged oven cooking.

Ingredients

For the Frittata

• 2 cups egg whites, about 12 large egg whites
• 3 Tbsp full-fat dairy: milk, sour cream, cream cheese, or heavy cream
• 1/2 cup crumbled feta cheese, 50 g
• 1/2 cup grated Parmesan cheese, 50 g
• 1 Tbsp olive oil, 15 mL
• 2 cups sliced mushrooms, 170 g
• 2 handfuls fresh spinach
• 1/4 tsp salt

For the egg whites, you can use carton liquid egg whites or separate the whites from large eggs. Keep the vegetable amounts as written because the moisture level affects how the frittata sets.

The 3 Tbsp of full-fat dairy can be milk, sour cream, cream cheese, or heavy cream. Use one of these approved options without changing the quantity.

How to Make This Recipe

Step 1: Whisk the egg mixture

Preheat the oven to 425°F (218°C). In a mixing bowl, whisk together the 2 cups egg whites, 3 Tbsp full-fat dairy, and half of the feta and Parmesan. Mix until evenly combined, then set the bowl aside while you prepare the vegetables.

Pro Tip: Get the egg mixture ready before heating the skillet so everything is ready to go once the vegetables are cooked.

Step 2: Cook the vegetables

Heat 1 Tbsp olive oil in a large oven-safe skillet over medium heat. Add the sliced mushrooms and cook for about 5 minutes, until softened and much of their moisture has cooked away. Add the spinach and cook for about 1 minute, just until wilted. Season with the salt.

The mushrooms should no longer look watery in the skillet. This step matters because excess vegetable moisture can leave the finished frittata loose.

Step 3: Start the frittata on the stovetop

Pour the egg mixture over the vegetables and let it cook for about 30 seconds, just until the outer portion begins to set and lighten. Sprinkle the remaining feta and Parmesan evenly over the top.

Don’t try to fully cook the eggs on the stovetop. This brief start simply gets the edges setting before the skillet moves into the oven.

Step 4: Bake until set

Transfer the skillet to the preheated 425°F (218°C) oven and bake for 8–10 minutes, until the frittata is set. The center should no longer look wet or loose and should reach 160°F (71°C) for a reliable doneness check. Remove it from the oven, let it settle briefly, then slice into 8 pieces and serve warm or at room temperature.

Pro Tip: Start checking toward the lower end of the baking range. Overbaking egg whites can make them firm and dry.

Expert Tips for Better Results

• Cook the mushrooms long enough for their excess moisture to evaporate before adding the eggs.
• Keep the spinach cooking time short; it only needs about 1 minute to wilt.
• Use a large skillet that is fully oven-safe at 425°F, including its handle.
• Judge doneness by both appearance and temperature. The center should be set and reach 160°F (71°C).
• Avoid extending the oven time simply because the top is not deeply browned. This recipe is about a tender, set frittata rather than a heavily browned one.

Serving Suggestions

• Serve two slices with fresh fruit for a simple breakfast plate.
• Pair it with whole-grain toast for a more substantial morning meal.
• Add a simple green salad for an easy lunch.
• Serve it at room temperature as part of a brunch spread.
• Pair it with roasted potatoes when you want a heartier breakfast.

Storage and Reheating

• Refrigerator: Store cooled leftovers in an airtight container and use within 3–4 days.
• Freezer: The primary recipe allows freezing for up to 3 months. Wrap the frittata well before freezing.
• Thawing: Thaw frozen frittata in the refrigerator before reheating.
• Reheating: Reheat until the center reaches 165°F (74°C).
• Texture note: Reheating can make the egg whites firmer, so avoid heating the frittata longer than necessary.