High-Protein Pizza Breakfast Casserole

One Tuesday morning, I was staring at my fridge thinking about meal prep when I spotted a container of Greek yogurt and wondered if I could turn it into pizza dough. The experiment worked, and soon I was layering eggs and pepperoni over it like some kind of breakfast pizza dream. My family devoured it before I could even photograph a slice, which told me everything I needed to know about this recipe.

I made this for a beach weekend with friends, and someone asked if I'd bought it from a bakery because the crust looked too good to be homemade. Watching them realize I'd made it in my Airbnb kitchen with basic ingredients felt like winning an award I didn't know I was competing for.

Ingredients

• Plain Greek yogurt: This is the secret base that replaces traditional pizza dough, giving you protein without heavy flour, and it keeps the crumb moist for days.
• Self-rising flour: Saves you the hassle of measuring baking powder separately, though you can absolutely use all-purpose flour if that's what you have on hand.
• Garlic powder and dried oregano: These tiny amounts transform the dough into something that actually tastes like pizza, not just bread with toppings.
• Eggs and low-fat milk: Mixed together they become a custard that sets into the most satisfying texture, binding everything while adding serious protein.
• Part-skim mozzarella and cheddar: The combination gives you stretch and flavor without turning the dish into a grease trap by the time it cools.
• Turkey pepperoni: Lighter than regular pepperoni but still delivers that salty, slightly spicy punch that makes you remember you're eating pizza for breakfast.
• Pizza sauce: Low-sugar versions keep the dish from becoming a sugar bomb, though honestly any sauce you like will work fine.
• Bell pepper and red onion: Optional but worth adding for texture and brightness that cuts through the richness.

Instructions

Prep your pan and heat your oven:

Set the oven to 400°F and get a 9x13-inch sheet pan ready with parchment paper or a light coating of cooking spray. This takes two minutes but makes cleanup infinitely easier.

Make the magic dough:

Dump Greek yogurt, self-rising flour, garlic powder, oregano, and salt into a bowl and mix until shaggy, then knead it on a floured surface for a couple of minutes until smooth. You're looking for something that feels like soft pizza dough, not sticky or dry.

Spread it thin and even:

Press or roll the dough to fit your pan, making sure it reaches the edges evenly so every slice gets that crispy crust. Don't stress about perfection here, rustic is better than robot-like.

Layer on the sauce:

Spread pizza sauce across the entire dough surface like you're making an actual pizza. Go a little lighter than you think you need, since too much sauce can make the bottom soggy.

Build the egg custard base:

Whisk together eggs, milk, salt, and pepper until completely combined and pour it evenly over the cheese. This is what turns it into a casserole and locks everything together.

Top with cheese and toppings:

Scatter pepperoni, remaining cheese, and any vegetables you're using across the top, making sure distribution is reasonably even. The cheese will bubble and brown beautifully while the eggs set underneath.

Bake until golden:

Slide it into the oven for 22 to 25 minutes, checking around minute 20 until the eggs are set and the cheese is bubbling at the edges. You want some golden browning on top but not burnt spots unless that's your style.

Rest and slice:

Let it cool for 5 minutes so the structure sets, then slice it into six squares or however you like and serve warm. A little fresh basil or parsley scattered on top makes people think you're fancier than you actually are.

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My mom tried this and immediately texted her book club group chat asking me for the recipe, which felt like the ultimate compliment coming from a woman who treats cooking like it should be complicated. Suddenly this casserole became the thing I was known for among her friends, which is funny considering I invented it by accident.

Why This Works for Meal Prep

This casserole actually tastes better on day two or three than it does fresh, which makes it perfect for Sunday meal prep when you're trying to set yourself up for the week. The flavors meld, the texture stays pleasant even when reheated, and you can portion it into containers so breakfast is literally grab-and-go.

The Greek Yogurt Dough Game Changer

The first time I realized Greek yogurt could substitute for heavy doughs was honestly a happy accident born from laziness and what I had in my fridge. It sounds like it shouldn't work, but the moisture from the yogurt combined with self-rising flour creates something that bakes up crispy on the outside and tender inside, tasting nothing like a protein hack and everything like actual pizza.

Customization and Flavor Riffs

This is the kind of dish that welcomes experimentation because the base is so forgiving and the flavor profile is broad enough to handle swaps. I've made it with spinach mixed into the egg layer, swapped the pepperoni for cooked crumbled sausage, and even tried it with sun-dried tomatoes when I was feeling fancy.

• Red pepper flakes mixed into the egg custard add a gentle heat that builds as you eat without overwhelming the breakfast vibe.
• If you can't do dairy, cashew cream works for the milk and dairy-free cheese melts just fine, though you lose a bit of that ooey-gooey moment.
• Meal prep tip: assemble everything the night before and refrigerate, then just bake in the morning for fresh-baked taste without the morning effort.

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This casserole taught me that breakfast doesn't have to choose between tasting indulgent and being actually nutritious, you can have both. Make it once and you'll understand why my friends still ask about it months later.

Recipe Questions & Answers

→ Can I make this breakfast casserole ahead of time?

Yes, this casserole is excellent for meal prep. You can assemble it the night before and bake it fresh in the morning, or bake it completely and store individual portions in the refrigerator for 3-4 days. Reheat in the microwave for 1-2 minutes or in a 350°F oven until warmed through.

→ What makes the Greek yogurt dough work?

The combination of Greek yogurt and self-rising flour creates a tender, pliable dough that's surprisingly high in protein. The acidity in yogurt activates the baking powder in self-rising flour, creating lift while the moisture content produces a soft texture that's perfect for this style casserole base.

→ Can I use regular flour instead of self-rising?

Absolutely. For each cup of all-purpose flour, add 1½ teaspoons baking powder and ¼ teaspoon salt. Whisk these together thoroughly before combining with the Greek yogurt and seasonings. The results will be nearly identical to using self-rising flour.

→ How do I know when the casserole is done baking?

The casserole is ready when the eggs are completely set—no liquid or jiggly center remains—and the cheese on top is golden and bubbly. This typically takes 22-25 minutes at 400°F. The edges of the dough should be lightly browned and pulling slightly away from the pan.

→ What other toppings can I add?

Mushrooms, black olives, cooked Italian sausage, diced Canadian bacon, or fresh spinach work beautifully. Just keep in mind that moisture-rich vegetables like mushrooms should be sautéed first to prevent making the casserole soggy.

→ Is this suitable for freezing?

Yes, after baking and cooling completely, wrap the entire casserole tightly in plastic and foil, or portion into individual containers. Freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.