Recipe: Smoky Mozzarella Pasta and Meatball Bake

Name: Recipe: Smoky Mozzarella Pasta and Meatball Bake
Ingredients: 1 pound penne pasta; 1 tablespoon olive oil, plus more for coating the baking dish; 2 cloves garlic, minced; 1/4 teaspoon red pepper flakes; 2 (28-ounce) cans diced fire-roasted tomatoes; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 5 ounces baby spinach; 1 (16-ounce) bag frozen meatballs, thawed; 2 cups (8 ounces) shredded part-skim mozzarella cheese, divided; 1 cup (4 ounces) shredded fontina cheese, divided