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Old Fashioned Pizza Casserole in a white casserole dish sitting on the table

Easy Pizza Casserole Recipe

This easy pizza casserole recipe is packed with the bold, cheesy flavors of a classic supreme pizza — but baked into a comforting, crustless casserole. Made with Italian sausage, pepperoni, fresh veggies, and marinara sauce, it's a family favorite for weeknights, holidays, or potlucks. Quick to make, easy to customize, and always a crowd-pleaser!
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 10
Course: Main Course
Ingredients Equipment Method Notes

Ingredients
  

  • 2 pounds Italian sausage swap 1 lb for ground beef or chicken Italian sausage if preferred
  • 3 garlic cloves minced
  • ½ large red onion chopped
  • 1 cup green pepper chopped
  • 1 cup red bell pepper chopped
  • 8 ounces button mushrooms sliced
  • 1 tablespoon Italian seasoning
  • 5 ounces pepperoni
  • 2 cups marinara sauce
  • 4 ounces black olives sliced
  • 2 cups mozzarella cheese shredded
  • 1 cup cheddar cheese shredded
  • ½ cup parmesan cheese shredded

Equipment

  • 9x13 casserole dish

Method
 

  1. Preheat your oven to 425°F. Grease a 9x13 baking dish and set aside.
  2. In a large skillet, cook the Italian sausage until browned and fully cooked. Remove from pan and set aside, leaving the grease behind (or add a little olive oil if needed).
  3. In the same skillet, sauté the garlic, chopped onion, bell peppers, mushrooms, and Italian seasoning until softened and fragrant.
  4. In the 9x13 dish, layer half of the sausage, veggies, 1 cup marinara, half the cheese, half the pepperoni, and half the olives. Repeat the layers.
  5. Bake for 15–20 minutes until bubbly. Broil for 1–2 minutes if desired. Let it rest 5–10 minutes before serving. Garnish with red pepper flakes, chopped parsley, or extra parmesan if you like.

Notes

  • Shred your own cheese if you can — it melts beautifully and skips the added starches found in pre-shredded bags (plus it's lower in carbs).
  • Customize it just like your favorite pizza. Don’t love mushrooms or peppers? Skip ’em! You can scale back any veggie to suit your tastes or keep it more low-carb.
  • Sneak in extra veggies by mixing in a cup or two of sautéed or microwaved cauliflower rice. It blends right in and adds heartiness without changing the flavor.
  • Rao’s marinara sauce is our go-to — no added sugar, and it tastes like homemade. If you spot it at Costco or Walmart, it’s usually 30% cheaper than regular grocery stores.
  • No Rao’s? No problem. Use any marinara or pizza sauce you love. This casserole is super forgiving.