High-Protein Pizza Breakfast Casserole

One Saturday morning, my partner wandered into the kitchen asking for something that tasted like pizza but wouldn't leave us sluggish by mid-morning. I'd been experimenting with Greek yogurt doughs, and it hit me—why not layer those flavors into a breakfast casserole that actually kept us full? The first time I pulled it from the oven, the cheese was bubbling golden and the whole kitchen smelled like a pizzeria. We devoured half of it before the eggs even fully cooled, and I knew I'd stumbled onto something worth making again and again.

I made this for a Sunday brunch gathering where everyone was exhausted from a weekend of activities, and instead of my usual scrambled eggs routine, I brought out the casserole still warm from the oven. Watching people's faces light up when they realized it tasted like pizza was worth every minute in the kitchen. One friend asked for the recipe right then, fork still in hand, which tells you everything.

Ingredients

• Plain Greek yogurt (1 cup, 2% or 0% fat): This is your secret weapon for a tender, protein-packed base that comes together without yeast or complicated rising times.
• Self-rising flour (1 cup): The leavening is already built in, so your dough rises beautifully without extra work.
• Garlic powder and dried oregano (1/2 tsp each): These are the quiet pizzeria flavors that make people ask what you did differently.
• Large eggs (6): These become your creamy custard layer and boost the protein considerably.
• Shredded mozzarella and cheddar cheese (1 1/2 cups combined): Part-skim versions keep things lighter without sacrificing that melted, gooey texture you're after.
• Turkey pepperoni (1/2 cup): Leaner than traditional pepperoni but packed with that familiar, slightly spiced flavor.
• Pizza sauce (1/2 cup): Go for low-sugar versions if you're watching carbs, and taste it first—some brands run quite salty.
• Low-fat milk (1/2 cup): This keeps the egg custard creamy and silky rather than dense and rubbery.
• Bell pepper and red onion (optional): Fresh vegetables add texture and brightness, but honestly, the casserole is spectacular without them too.

Instructions

Heat your oven and prepare the pan:

Set the oven to 400°F and line a 9x13-inch sheet pan with parchment paper or a light grease. You want the pan ready so your dough doesn't dry out while you're fussing with setup.

Mix the Greek yogurt dough:

In a medium bowl, combine the Greek yogurt, self-rising flour, garlic powder, oregano, and salt, stirring until shaggy bits form. Dust your counter with flour and knead for just 2–3 minutes until it's smooth and cohesive, then you're done—no long kneading required.

Spread the dough base:

Roll or press the dough to fit your pan evenly, working it to the edges. The dough should be roughly 1/4-inch thick and cover the entire surface for a pizza-like base.

Layer the sauce and cheese:

Spread the pizza sauce evenly over the dough, then scatter half of the mozzarella and cheddar across the top. This first cheese layer creates pockets of flavor throughout.

Prepare and pour the egg mixture:

Whisk together the eggs, milk, a pinch of salt, and black pepper in a large bowl until completely combined. Pour this custard mixture evenly over the cheese layer—it'll look like a lot, but it'll settle and set beautifully as it bakes.

Add final toppings:

Sprinkle the turkey pepperoni, remaining cheese, and any diced peppers or onions across the top. The arrangement doesn't need to be perfect; just distribute everything evenly.

Bake until set and golden:

Slide into the oven for 22–25 minutes, watching until the eggs are set (they'll jiggle just slightly at the center if you shake the pan gently) and the cheese has turned golden and bubbly. Overbaking dries out the eggs, so keep an eye on it toward the end.

Cool and serve:

Let it rest for 5 minutes out of the oven—this helps it set and makes slicing cleaner. Garnish with fresh basil or parsley if you'd like, then slice and serve warm.

Save

There's something deeply satisfying about cutting into this casserole and seeing all the layers—the golden base, the melted cheese pockets, the pepperoni flecks distributed throughout. My mom tried it once and immediately started thinking about making it for her book club, which is the highest compliment she gives anything I cook.

Make-Ahead Magic

This casserole genuinely thrives as a meal-prep dish. You can assemble the entire thing the night before, cover it with plastic wrap, and slide it straight into the oven in the morning—just add a few extra minutes to the baking time since it'll start cold. I've done this on hectic Mondays when every minute counts, and it's saved me from reaching for something less nourishing.

Flavor Variations That Feel Natural

The beauty of this base is how forgiving it is to tweaks. I've added everything from sun-dried tomatoes to spinach, swapped the cheddar for provolone, and even experimented with spicy sausage crumbles instead of pepperoni. The Greek yogurt dough stays tender, the eggs remain creamy, and you still get that pizza-for-breakfast feeling that makes the whole thing work.

Storage and Leftover Ideas

Slices keep beautifully in the refrigerator for three to four days, and they reheat gently in a 325°F oven until warm—much better than the microwave, which can make the texture rubbery. You can even freeze individual portions wrapped well, then thaw and reheat them on busy mornings when you need breakfast without the cooking.

• Cold slices straight from the fridge taste wonderful with a simple green salad on the side.
• Reheat leftovers wrapped in foil rather than uncovered to keep the cheese from drying out.
• This pairs wonderfully with fresh fruit, a yogurt parfait, or even a light tomato soup for a lighter dinner.

Save

This casserole has become my answer to 'what should we have for breakfast on a lazy morning,' and it's become something I make whenever I want to feel a little indulgent without guilt. There's honest nutrition here, real flavor, and the kind of comfort that only pizza-inspired food can deliver.

Recipe FAQs

→ Can I make this breakfast casserole ahead of time?

Yes, you can assemble the entire casserole the night before and refrigerate it. Bake fresh in the morning, or bake completely and reheat individual portions throughout the week for quick breakfasts.

→ What can I substitute for self-rising flour?

Mix 1 cup all-purpose flour with 1 1/2 teaspoons baking powder and 1/4 teaspoon salt. This combination works perfectly as a substitute in the Greek yogurt dough.

→ How do I store leftovers?

Store cooled portions in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave for 1-2 minutes or in a 350°F oven until warmed through.

→ Can I freeze this breakfast casserole?

Yes, wrap individual portions tightly in plastic wrap and foil, then freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

→ What other toppings work well in this dish?

Mushrooms, spinach, black olives, diced tomatoes, or cooked turkey sausage all make excellent additions. Just keep the total amount similar to avoid overcrowding the pan.