Better than Pizza Sheet Pan Casserole | Easy & Quick Dinner Casserole Recipe

This sheet pan casserole offers a healthier, lower-carb alternative to traditional pizza, packed with fresh vegetables and a flavorful egg base. It’s a quick and easy dinner option that satisfies pizza cravings without the guilt.
Ingredients
- 2/3 cup all-purpose flour (or almond flour for lower carb)
- 1 teaspoon baking powder
- 1/4 – 1/2 teaspoon salt (optional)
- 1/4 teaspoon black pepper
- 6 large eggs
- 1/2 cup heavy cream (or whole milk)
- 1/3 cup grated Parmesan cheese
- Garlic powder (to taste)
- Onion powder (to taste)
- Italian herbs (to taste)
- 8 oz low moisture mozzarella cheese, shredded
- 2-3 medium tomatoes, sliced
- 1 medium onion, sliced
- 1 bell pepper, sliced
- 1 cup mushrooms, sliced
- Olive oil
- Cooking oil
- Parchment paper
- Crushed red pepper flakes (for garnish)
Preparation Time
- Total Time: 30 minutes
- Prep Time: 10 minutes
- Cook Time: 20-25 minutes
- Servings: 6-8
Step 1: Prep Vegetables
Slice tomatoes, onions, bell pepper, and mushrooms.

Step 2: Prepare the Batter
Crack six eggs into a bowl and whisk.

Add heavy cream (or milk) and whisk.

Add garlic powder, onion powder, Italian herbs, and Parmesan cheese. Mix well.

Sift in all-purpose flour (or almond flour) and baking powder. Add salt (optional) and black pepper. Mix until smooth and no lumps remain.

Step 3: Assemble the Casserole
Grease a large baking sheet with cooking oil and line with parchment paper. Lightly grease the parchment paper with olive oil.

Layer sliced tomatoes on the parchment paper, sprinkle with Italian herbs. Add a layer of mushrooms.

Add a layer of sliced onions. Reserve bell peppers for later.

Pour the egg batter evenly over the vegetables.

Sprinkle a layer of mozzarella cheese over the batter.

Add remaining tomatoes, onions, and bell peppers. Spread them evenly over the cheese.

Step 4: Bake
Preheat oven to 450°F (232°C).

Sprinkle the remaining mozzarella cheese over the vegetables.

Bake for 20-25 minutes, or until golden brown and bubbly.
Step 5: Serve
Remove from oven and let cool slightly.

Slice into squares and serve hot.

Garnish with a mixture of grated Parmesan cheese and crushed red pepper flakes (optional).
