Quick Meals

Egg White Frittata with Spinach (High Protein, Zero Guilt)

3 min

Give the garlic about 30 seconds in the oil, just until it smells sharp, then pile in the spinach and let it collapse before any egg goes near the pan. Egg whites set firmer and drier than whole eggs, so the milk and the optional two yolks here are doing real work, keeping the wedges tender instead of rubbery. I cook it on the stove only until the edges grip the skillet, then move the whole thing to a 375F oven so the top puffs without the bottom turning into a hockey puck.

By Nora Calloway

A little backstory

The frittata is the Italian answer to using up odds and ends, and the name comes from "fritto," meaning fried, since the older method was a slow stovetop cook flipped to finish the second side. The oven version most of us make now is a newer shortcut. This egg-white, feta-and-spinach take leans more toward a high-protein gym-breakfast riff than anything you'd find in a nonna's kitchen.

Egg whites get a bad rap. Boring. Bland. Sad.

Not this time. This frittata is fluffy, savory, and packed with garlicky spinach and salty feta. No yolks? No problem. You won’t miss them. Perfect for meal prep. Perfect for using up that bag of spinach about to go bad.

Step-by-Step Instructions

1 1

Preheat and Prep

Preheat oven to 375°F (190°C).

In a bowl, whisk egg whites, whole eggs (if using), milk, salt, pepper, and red pepper flakes.

2 2

Cook the Spinach

Heat olive oil in an oven-safe skillet (cast iron or nonstick) over medium heat.

Add garlic. Cook for 30 seconds until fragrant.

Add spinach. Cook for 2–3 minutes until wilted. Season with a pinch of salt.

3 3

Add Eggs and Cheese

Spread spinach evenly in the skillet.

Pour egg mixture over spinach. Sprinkle with feta and Parmesan.

Cook without stirring for 2–3 minutes until edges start to set.

4 4

Bake the Frittata

Transfer skillet to the oven.

Bake for 10–12 minutes until puffed and golden, and center is just set.

5 5

Serve

Let cool for 5 minutes. Slice into wedges.

Serve warm, at room temperature, or cold. Great with toast or a side salad.

Summary

Prep Time: 5 minutes | Cook Time: 15 minutes | Total Time: 20 minutes

Yield: 4 servings

Difficulty: Easy

Storage Notes

How to Store:

Refrigerate in an airtight container for up to 4 days. Great for meal prep.

How to Reheat:

Microwave for 30–45 seconds. Or eat cold—it’s delicious straight from the fridge.

Freezer-Friendly:

Freeze individual slices for up to 2 months. Thaw overnight in the fridge or reheat from frozen.

Pro Tip:

Don’t over-bake. The frittata should still be slightly jiggly in the center when you pull it out. Carryover cooking will finish it.

The Ingredients

Everything you need.

Prep

5 minutes

Cook

15 minutes

Total

20 minutes

Yield

4 servings

Ingredients

Serves 4.

8 egg whites (or 1 cup liquid egg whites)
2 whole eggs (optional but adds richness)
4 cups fresh spinach, roughly chopped
2 cloves garlic, minced
¼ cup feta cheese, crumbled
2 tablespoons grated Parmesan cheese
1 tablespoon olive oil
¼ cup milk or unsweetened almond milk
¼ teaspoon salt
¼ teaspoon black pepper
¼ teaspoon red pepper flakes (optional)

Instructions

1
Preheat and Prep. Preheat and Prep. Preheat oven to 375°F (190°C). In a bowl, whisk egg whites, whole eggs (if using), milk, salt, pepper, and red pepper flakes. 2 2
2
Cook the Spinach. Cook the Spinach. Heat olive oil in an oven-safe skillet (cast iron or nonstick) over medium heat. Add garlic. Cook for 30 seconds until fragrant. Add spinach. Cook for 2–3 minutes until wilted. Season with a pinch of salt. 3 3
3
Add Eggs and Cheese. Add Eggs and Cheese. Spread spinach evenly in the skillet. Pour egg mixture over spinach. Sprinkle with feta and Parmesan. Cook without stirring for 2–3 minutes until edges start to set. 4 4
4
Bake the Frittata. Bake the Frittata. Transfer skillet to the oven. Bake for 10–12 minutes until puffed and golden, and center is just set. 5 5
5
Serve. Serve. Let cool for 5 minutes. Slice into wedges. Serve warm, at room temperature, or cold. Great with toast or a side salad

Swaps & Substitutions

Whole eggs only → skip the whites and use 5 to 6 whole eggs; richer and more custardy, but you lose the lean, high-protein angle.
Dairy-free → use unsweetened almond milk and drop the feta and Parmesan, or swap in a melty plant-based feta; flavor goes flatter, so add an extra pinch of salt.
No feta → goat cheese or crumbled queso fresco both work; for a milder result use a handful of shredded mozzarella.
Fresh spinach out → thaw and squeeze dry about 1 cup frozen spinach; wet spinach waters down the eggs, so wring it hard.
No oven-safe skillet → cook everything in any pan, then slide it into a greased baking dish before the egg goes in and bake from there.
Salted seasoning → feta and Parmesan are both salty, so taste before adding the full 1/4 teaspoon salt and cut it back if needed.

Questions & Answers

Why did my frittata turn out rubbery?

Egg whites overcook fast. Pull it from the oven when the center still has a slight jiggle and looks just set; carryover heat firms it up as it rests.

Can I make it ahead?

Yes. It keeps 3 to 4 days covered in the fridge and is good cold or reheated. Slice into wedges once fully cooled so it holds its shape.

Do I have to use the whole eggs?

No, they're optional. The two yolks add color and keep things tender, but a pure egg-white version works; just expect a paler, slightly drier result and don't overbake it.

Can I freeze the wedges?

They freeze fine for up to 2 months. Wrap individual wedges, then reheat from frozen in the microwave or a low oven. The texture softens a little but holds together.

How do I know when it's done in the oven?

Look for a puffed, lightly golden top with a center that no longer looks wet. At 375F that's usually 10 to 12 minutes; a knife near the middle should come out clean.

Egg White Frittata with Spinach (High Protein, Zero Guilt)