Pizza Casserole

Ingredients

• 3 tablespoons olive oil, divided
• 1 pound dried penne pasta
• 8 ounces baby portobello or cremini mushrooms
• 1 small shallot
• 2 cloves garlic
• 4 ounces thinly sliced pepperoni, divided
• 8 ounces low-moisture mozzarella cheese, shredded (about 2 cups)
• 1 tablespoon Italian seasoning
• 1 teaspoon red pepper flakes (optional)
• 1/2 teaspoon kosher salt, plus more as needed
• 1/2 teaspoon freshly ground black pepper
• 1 (about 24-ounce) jar marinara sauce

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