My Mom’s 4-Ingredient Casserole Feeds a Crowd for Next to Nothing

Preheat the oven to 425°F.

In a large bowl, mix together the raw penne, marinara sauce, and sliced sausage until well combined. Pour the pasta mixture into a 9x13-inch casserole dish and top with the mozzarella cheese in an even layer.

Bake until the casserole is bubbly and the cheese has turned golden brown, about 25 minutes. Let the casserole rest for 10 minutes at room temperature before serving. Leftovers can be refrigerated in an airtight container for up to 1 week. Reheat in a 350°F oven until heated through, or reheat individual servings in the microwave.