Preheat oven to 350°. Spray a shallow 3-quart baking dish with cooking spray.
In a large skillet, heat oil over medium-high heat. Add meatballs; cook, turning occasionally, until browned, about 4 minutes. Remove from heat.
In a large bowl, combine meatballs, pasta, marinara sauce, tomato sauce, Italian seasoning, salt, and pepper. Add 2 cups mozzarella and ½ cup Parmesan, stirring until coated. Spoon mixture into prepared dish. Loosely cover with foil.
Bake until heated through, about 30 minutes. Uncover; sprinkle with remaining 2 cups mozzarella and remaining ½ cup Parmesan. Bake until cheese is melted, about 5 minutes more. Garnish with basil and pepper, if desired.
Notes
*We used Rosina Celentano Italian Style Meatballs.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/meatball-bowtie-pasta-casserole-recipe/