Dinner · Part 2 of 3: Instructions
Easy Crockpot Meatball Mozzarella Penne Step-by-step instructions

- Prep
- Cook
- Total
- Serves
- 4
Before you start
Ensure your slow cooker is clean and positioned on a level, heat-resistant surface near an outlet. Have all ingredients measured and ready, especially the marinara sauce and the shredded mozzarella.
If you are using a slow cooker liner, insert it now to make cleanup even faster, though it is not strictly necessary for this recipe. Make sure the meatballs are thawed if they were previously frozen to ensure consistent cooking throughout the entire dish.
Ingredients at a glance (5)
- 1 lb Italian meatballs
- 1 lb penne pasta, uncooked
- 1 packet spaghetti seasoning
- 24 oz marinara sauce
- 2 cups shredded mozzarella cheese
Instructions
Initial Assembly
- Assemble the ingredientsPlace the Italian meatballs in the bottom of the slow cooker basin. Scatter the dry, uncooked penne pasta evenly over the top of the meatballs to ensure even distribution during the cooking process.Look for Meatballs are at the bottom and pasta is distributed over the top.Tip Ensure the pasta is spread out so it cooks uniformly in the sauce.
The meatballs should be arranged in a single layer if possible, and the dry penne should be distributed evenly across the surface.
Ensure there is no large pile of pasta that might stick together during the cooking process, as even distribution is key to achieving a uniform texture throughout the final meal.
Seasoning and Liquid
- Season and add liquidSprinkle the entire packet of spaghetti seasoning over the pasta. Pour the marinara sauce over the top of the seasoning and pasta, ensuring all the pasta is covered by the sauce to prevent drying out during the long cook time.Look for Pasta is fully submerged in the marinara sauce.Tip Use a spatula to gently push down any dry pasta pieces into the sauce.
The marinara sauce must fully coat the pasta and seasoning. Once poured, ensure no dry pasta is visible on the surface. If you see any stray noodles poking out, use a spoon to gently submerge them into the liquid, ensuring they are properly hydrated and will cook through evenly during the simmering phase.
Cooking and Melting
- Cook and finishCover the slow cooker and cook on low for 4 hours. Once the meatballs reach a safe internal temperature of 160°F (71°C), sprinkle the mozzarella cheese over the top, cover again, and let it sit for 5 minutes until the cheese is perfectly melted and stretchy.Look for Cheese is melted and the sauce is bubbling.Safe temperature 160°F (71°C) internal temperature (ground meat)Tip Check the internal temperature of the largest meatball with a meat thermometer.
The sauce will be bubbling and fragrant, and the meatballs will be fully cooked. The mozzarella should be added only once the pasta is ready, allowing just enough time for it to melt into a gooey, delicious layer. Check the internal temperature of the meat to confirm it is safe and ready to serve.
Common mistakes
A common mistake is failing to ensure the dry pasta is completely covered by the marinara sauce, which leads to unevenly cooked or crunchy noodles. Another error is opening the lid too frequently, which allows heat to escape and increases the total cooking time significantly.
Always resist the urge to peek during the first few hours of cooking; keep the lid tightly sealed to maintain the consistent temperature required for the pasta and meatballs to cook perfectly.
How to tell it’s done
The dish is ready when the pasta is tender to the bite and the meatballs are heated through to an internal temperature of 160°F (71°C). The sauce should be rich and slightly thickened, coating the pasta completely.
The final addition of mozzarella should be completely melted and stretchy, with no solid bits remaining. If the sauce appears too thick, you can stir in a splash of water or broth before serving to achieve your desired consistency.
- Ground meat: 160°F (71°C) in the thickest part
Up next · Part 3 of 3
2 variations · storage & make-ahead · 3 answers · printable card
Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)