Slow Cooker Baked Spaghetti

This Slow Cooker Baked Spaghetti recipe is an easy and comforting dinner that comes together so simply in the slow cooker! With tender pasta that is not mushy and a rich beef sauce and melted cheese.

We love cooler evenings because it means that easy meals like this Slow Cooker Baked Spaghetti are back on the table alongside Cheesy Garlic Bread Dippers. Comfort foods and especially those that feel wholesome and nourish our bodies are my favorite kinds of meals!

Ingredients

Here is what I use for this recipe and you can adjust nuts or spices based on preference:

• Lean ground beef: Provides savory flavor and hearty protein while forming the rich base of the spaghetti sauce.
• Yellow onion: Adds gentle sweetness and aromatic depth as it softens with the ground beef.
• Garlic: Builds a warm savory aroma that balances the tomato sauce and Italian seasoning.
• Crushed tomatoes: Creates the thick tomato foundation that coats and tenderizes the spaghetti.
• Tomato sauce: Adds smooth consistency and enough moisture for the pasta to cook evenly.
• Beef broth: Provides cooking liquid for the dry spaghetti while strengthening the savory flavor.
• Italian seasoning: Adds balanced dried herb flavor throughout the beef and tomato sauce.
• Kosher salt: Enhances the beef and tomato flavors while seasoning the pasta as it cooks.
• Black pepper: Adds mild warmth and earthy contrast to the sweet tomato base.
• Granulated sugar: Softens excess tomato acidity without making the finished sauce noticeably sweet.
• Spaghetti: Forms the tender pasta structure and absorbs the seasoned sauce while slowly cooking.
• Shredded mozzarella cheese: Melts into stretchy uneven pockets and forms the creamy top layer.
• Grated Parmesan cheese: Adds salty nutty flavor and helps create lightly golden patches across the melted cheese.
• Fresh parsley: Adds fresh color and a mild herbal finish to the plated spaghetti.

Tools You’ll Need

• Large cast iron skillet: Browns the ground beef and softens the onion while developing savory caramelized flavor.
• Six quart slow cooker: Holds the sauce and pasta while providing gentle heat for slow cooking and cheese melting.
• Wooden spoon: Breaks the beef into crumbles and folds the pasta through the thickening sauce.
• Measuring cups and spoons: Measures the broth and seasonings accurately so the pasta cooks with the correct liquid balance.
• Chef knife: Dices the onion and chops the parsley into practical uneven pieces.
• Cutting board: Provides a stable surface for preparing the onion and parsley.

Instructions

Step 1: Brown the beef with onion and garlic

Cook the ground beef with the diced onion until the meat changes from pink to deep brown and the onion becomes soft and translucent. Fold in the minced garlic near the end so it becomes fragrant while the irregular beef crumbles remain visibly moist and uneven.

Tip: Break the beef into varied small crumbles so the finished sauce feels homemade and distributes naturally through the pasta.

Step 2: Combine the beef and tomato sauce

Transfer the browned beef mixture into the slow cooker and pour in the crushed tomatoes and tomato sauce and beef broth. Stir in the seasoning until the sauce becomes evenly red with scattered beef crumbles and softened onion visible throughout.

Tip: Stir only until the sauce looks evenly combined because vigorous mixing can press the beef into an overly uniform texture.

Step 3: Add and submerge the broken spaghetti

Scatter the broken spaghetti across the sauce in loose crossing layers rather than placing every strand in the same direction. Press most of the pasta beneath the liquid while leaving a few uneven ends visible so the dry strands begin absorbing the sauce.

Tip: Separate the broken spaghetti as you add it because compact bundles can stick together and remain firmer than the surrounding pasta.

Step 4: Cook and fold the softened spaghetti

Cook until the spaghetti changes from rigid pale strands into flexible noodles that have absorbed the deep red sauce. Fold the noodles through the beef mixture so the strands shift into loose curls and the thickened sauce clings unevenly to every portion.

Tip: Fold the pasta once during cooking to separate overlapping strands while preserving a hearty sauce that is not overly stirred.

Step 5: Melt the mozzarella and Parmesan

Scatter the mozzarella and Parmesan over the softened spaghetti in an uneven layer with some sauce still visible around the edges. Continue cooking until the cheese changes into stretchy melted patches with creamy white areas and lightly golden Parmesan spots.

Tip: Scatter the cheese loosely instead of packing it down so steam can escape and the top develops varied melted textures.

Step 6: Serve a cheesy spaghetti portion

Lift one generous portion onto a white plate so the tender noodles fold naturally and reveal beef sauce beneath the melted cheese. Finish with chopped parsley while keeping the cheese stretches and sauce streaks irregular for a warm homemade appearance.

Tip: Rest the spaghetti briefly before serving so the sauce settles and each portion holds together without becoming dry.

Pro Tips

• Use lean ground beef so the sauce stays rich without becoming greasy while the pasta cooks slowly in the tomato mixture.
• Keep most spaghetti strands beneath the sauce because exposed dry ends may remain firm and cook less evenly than submerged pasta.
• Fold the pasta gently during cooking so stuck strands separate without breaking into very short pieces or turning overly soft.
• Add the cheese near the end so it melts into creamy patches instead of disappearing completely into the hot tomato sauce.

Storage Instructions

Allow the Slow Cooker Baked Spaghetti to cool before transferring portions into airtight containers. Refrigerate the portions for up to four days. Reheat individual servings with a small spoonful of water or tomato sauce. Cover the portion loosely so steam restores moisture to the pasta. Freeze cooled spaghetti in tightly sealed freezer containers for up to two months. Thaw each portion overnight in the refrigerator before reheating. Avoid leaving the cooked spaghetti at room temperature for more than two hours. Discard any portion that develops an unusual odor or appearance.

Frequently Asked Questions

See You in the Kitchen

I hope you try this Slow Cooker Baked Spaghetti soon!

It is a simple recipe that looks beautiful and tastes incredible and makes every occasion a little more special alongside Cheesy Garlic Bread Dippers or Chicken Bacon Ranch Pinwheels.

Do not forget to share your results or save this recipe for later because it is one worth keeping.

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