Timballo Spaghetti Casserole

• 1 tablespoon olive oil
• 1 (16 ounce) package spaghetti
• 2 (24 ounce) jars marinara sauce
• 3 cups cooked chicken breast meat, diced
• 1 large onion, diced
• 1 (7 ounce) package of sliced pepperoni, diced
• 1 green pepper, diced
• 1 (5 ounce) can mushroom pieces, drained
• 1 (3 ounce) can sliced black olives, drained
• 3 cups shredded mozzarella cheese
• 1 tablespoon grated Parmesan cheese, or to taste

1. Preheat oven to 350 degrees F (175 degrees C). Spread olive oil into the bottom of a cast-iron skillet or large baking dish.
2. Bring a large pot of lightly salted water to a boil. Cook spaghetti in the boiling water, stirring occasionally until cooked through but firm to the bite, about 12 minutes; drain.
3. Stir spaghetti, marinara sauce, diced chicken, onion, pepperoni, green pepper, mushroom pieces, and black olives together in a large bowl; transfer into the prepared cast-iron skillet. Top with mozzarella cheese in a layer and sprinkle with Parmesan cheese.
4. Bake in the preheated oven until casserole is bubbling, chicken is cooked through, and the cheese topping is lightly browned, about 30 minutes.

olive oil, marinara sauce, onion, pepperoni, green pepper, mushroom, black olives, mozzarella cheese, parmesan cheese

Taken from www.allrecipes.com/recipe/230657/timballo-spaghetti-casserole/ (may not work)