This easy Dump and Bake Spaghetti is the ultimate no-boil weeknight dinner! Uncooked spaghetti bakes right in the marinara sauce with tomatoes, vegetables, and seasonings, then gets topped with plenty of melty mozzarella cheese. With just 5 minutes of prep and everything made in one baking dish, it’s an easy, cheesy, family-friendly dinner perfect for busy nights.
Make sure the spaghetti is mostly submerged in liquid so the noodles cook evenly.
Do not drain the diced tomatoes. The tomato juices provide some of the liquid needed to cook the dry pasta.
Different brands of spaghetti may require slightly different cooking times. If the noodles are still too firm, bake for another 5–10 minutes.
Store leftovers in an airtight container in the refrigerator for 3–4 days.
For reheating, add a spoonful of marinara or a small splash of water if the spaghetti seems dry.