Rich and filling, this pizza-meets-garlic-bread casserole is perfect for a Friday night when your kid invites over half the neighborhood. The cheese, pepperoni, and mushrooms are a match made in heaven for buttery bread, and the bottom of the casserole gets nice and crisp. Pepperoni slices have a tendency to stick together, so make sure to separate them nicely when you stick them into the pan with the marinara. 


Read the full recipe after the video.

Recipe Summary

25 mins
35 mins
Serves 8 (serving size: 2 cups)


Ingredient Checklist


Instructions Checklist
  • Preheat oven to 425°F with rack in bottom position. Heat oil in a large skillet over high. Add mushrooms and onion; cook, stirring often, until mushrooms are browned and softened, 7 to 8 minutes. Stir in marinara sauce and 4 ounces of the pepperoni (about 56 slices). Remove from heat.

  • Coat a deep 13- x 9-inch casserole dish with cooking spray. Arrange garlic bread, lying flat with cut sides up, in casserole dish. Top evenly with mushroom-pepperoni mixture. Sprinkle with mozzarella. Arrange remaining 2 ounces pepperoni (about 28 slices) over mozzarella. Sprinkle with Parmesan. Bake in preheated oven until cheese is bubbly and lightly browned, 12 to 15 minutes. Let stand 5 minutes. If desired, sprinkle with crushed red pepper.