High-Protein Pizza Breakfast Casserole

My kitchen smelled like a pizzeria one Saturday morning when I decided to stop eating cereal and actually cook something that would stick with me until lunch. I'd been experimenting with Greek yogurt as a base for everything, and it hit me that a tender, tangy dough could hold up eggs and cheese just as well as any traditional crust. The first time I pulled this casserole out of the oven, golden and bubbling, my partner walked in asking what smelled so good, and I realized I'd accidentally created something that felt fancy but took less time than scrambling eggs.

I made this for a weekend brunch when my sister's family visited unexpectedly, and it became the one dish nobody expected to love so much. A seven-year-old asked for seconds, my mom asked for the recipe, and I spent the next hour explaining that no, there's no hidden spinach, just really good cheese and honest flavors. That moment made me realize some of the best kitchen wins happen when you're not trying to impress anyone, just feeding people you care about.

Ingredients

• All-purpose flour: Keep it light and airy by measuring into the cup then leveling off, because compacted flour changes everything about the dough's texture.
• Baking powder: This is what gives the dough that tender lift, so don't skip it or you'll end up with something dense.
• Plain Greek yogurt: Use nonfat or 2% to keep the protein high without adding unnecessary fat, and make sure it's actually yogurt and not some flavored version.
• Large eggs: They're the foundation of the filling, so use fresh ones and whisk them until they're pale and fully combined.
• Low-fat milk: This keeps the egg mixture creamy without weighing it down, and whole milk will work too if that's what you have.
• Part-skim mozzarella and reduced-fat cheddar: The combination gives you stretch and flavor, and buying them already shredded saves time when you're rushing.
• Turkey pepperoni: It browns beautifully and tastes better than you'd expect, especially when it gets crispy edges in the oven.
• Dried oregano and garlic powder: These two create that familiar pizza flavor, so measuring them out matters more than you'd think.
• Fresh parsley: It's optional but honestly makes the casserole look finished and tastes bright at the end.

Instructions

Heat your oven and prepare the pan:

Set the oven to 375°F and give your 9x13-inch pan a light coating of cooking spray or butter so the dough won't stick when you're trying to serve it. A sheet pan works great here because the sides help contain everything.

Make the Greek yogurt dough:

Whisk flour, baking powder, and salt together, then add the yogurt and mix until shaggy before kneading briefly until smooth. This dough should feel slightly tacky and forgiving, not stiff like bread dough.

Spread the dough base:

Press the dough evenly into the pan using wet fingers or the bottom of a measuring cup, creating a thin, even layer that covers the whole surface. Don't worry about making it perfect because it will puff up a bit as it bakes.

Whisk the egg filling:

Combine eggs, milk, oregano, garlic powder, and pepper in a large bowl until the mixture is uniform and the seasonings are fully dissolved. You should see no streaks of egg white by the time you're done whisking.

Layer and assemble:

Pour the egg mixture over the dough base, then sprinkle both cheeses evenly across, and finish with turkey pepperoni slices scattered on top. The pepperoni will curl slightly as it cooks, which is exactly what you want.

Bake until golden:

Slide the casserole into the oven for 20 to 25 minutes, watching until the eggs are set (they should jiggle just slightly in the very center) and the cheese is bubbling at the edges. You'll know it's done when the kitchen smells incredible and your oven light shows golden, puffy cheese.

Cool, garnish, and serve:

Let it rest for five minutes before you slice so the eggs can fully set, then add fresh parsley if you have it and serve while everything is still warm. Cutting it into six generous pieces or eight smaller ones depending on hunger levels works perfectly.

Save

There's something about pulling a whole casserole out of the oven that makes you feel like you actually know how to cook, even if you've been winging it the whole time. This dish became the thing I make when I need a win in the kitchen, and it's never let me down.

Why This Works as a Breakfast Powerhouse

Greek yogurt has this magic ability to create structure without needing yeast or long rising times, which is why this casserole works on a regular Tuesday morning instead of requiring weekend planning. The protein from the yogurt, eggs, and cheese stacks up naturally, so you're not eating something that tastes healthy but actually feels substantial. I stopped buying those protein bars that taste like sawdust because this casserole sits in my fridge ready to reheat whenever I need actual food.

Making It Your Own

The beauty of a breakfast casserole is that it's a framework, not a rule, so I've added everything from sautéed spinach to diced bell peppers without anything ever going wrong. Switching the turkey pepperoni for chicken sausage feels different enough to make, and vegetarian pepperoni honestly tastes better than people expect. Even just adding garlic or experimenting with different cheeses changes the whole personality of the dish without breaking anything.

Storage and Serving Ideas

This casserole reheats beautifully in a 350°F oven for about ten minutes, or you can microwave individual slices and they stay fluffy instead of turning rubbery. I've brought this to brunches, potlucks, and regular weekday breakfasts, and it works equally well in all of them. Some people swear by dipping it in marinara sauce, which sounds weird until you realize pizza for breakfast is actually genius.

• Store it in an airtight container in the fridge for up to four days and it stays perfectly good.
• You can freeze individual slices wrapped in foil for up to a month, then thaw overnight in the fridge before reheating.
• Serve it warm or at room temperature, and honestly both versions are delicious depending on the season.

Save

This casserole turned into my secret weapon for mornings when I want to feel like I'm taking care of myself without actually fussing around. Make it once and you'll understand why it stays in rotation.

Cooking Q&A

→ Can I make this ahead of time?

Yes, this casserole reheats beautifully. Store portions in airtight containers in the refrigerator for up to 4 days. Reheat individual slices in the microwave for 1-2 minutes or in a 350°F oven until warmed through.

→ Can I freeze the leftovers?

Absolutely. Cut into portions and wrap tightly in plastic wrap and foil, or place in freezer-safe containers. Freeze for up to 2 months. Thaw overnight in the refrigerator before reheating.

→ What vegetables can I add?

Diced bell peppers, mushrooms, spinach, onions, or zucchini work wonderfully. Sauté vegetables briefly before adding to prevent excess moisture in the dish.

→ Can I use regular pepperoni?

Yes, regular pepperoni works fine. Turkey pepperoni simply reduces the fat content. If using regular pepperoni, you may want to pat the slices with paper towels to remove excess oil before baking.

→ Is the dough really made with Greek yogurt?

Yes, the two-ingredient dough is a well-known technique. Greek yogurt combined with flour and baking powder creates a surprisingly pliable, pizza-like crust that bakes up beautifully under the egg and cheese topping.