Leave the jars of sauce on the shelf! Try the best Slow Cooker Spaghetti Sauce Recipe – made from scratch and perfect for a classic spaghetti dinner! With simple ingredients and a homemade seasoning, this meaty sauce is rich and full of authentic flavor.

spaghetti sauce with pasta and two forks on white plate with slow cooker in background

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What’s To Love About This Recipe

Spaghetti sauce in the slow cooker is super easy to prep! Just layer the ingredients and let the slow cooker do the work. It’s fresher than a jar of sauce and hardly takes any more time to prepare.
In the slow cooker, you’ll get a rich, savory flavor that develops slowly throughout the day.
A big batch of homemade spaghetti sauce is very budget-friendly and can be made with pantry staples. Keep these items on hand for easy meal prep!
Meaty spaghetti sauce is also freezer-friendly for easy make-ahead meals. Portion into single-meal servings for a regular pasta night.
This is an excellent option for feeding a crowd or batch cooking for the week. It’s super helpful to let it simmer away in the slow cooker and not have to worry about burning on the stove.
Don’t stop with just spaghetti! Use this over any pasta variation, in lasagna, with a side of veggies, or even for meatball subs.

Ingredients Needed

Lean ground beef – Choose ground beef that is 93% lean or leaner to prevent the sauce from becoming too greasy. With lean meat, you won’t need to drain off excess grease, and a little bit of fat adds richness and flavor to the sauce.
Yellow onion – Finely chop a small yellow onion to bring a slight sweetness to the spaghetti sauce.
Garlic – Mince 3 cloves of fresh garlic for maximum flavor, or feel free to use jarred minced garlic for convenience. Plenty of garlic brings that authentic Italian flavor!
Crushed tomatoes – Canned crushed tomatoes add a nice rustic texture to the sauce and thicken it perfectly for pasta servings.
Tomato sauce – Tomato sauce balances the crushed tomatoes and adds a smooth consistency to the sauce base.
Tomato paste – Third in the tomato-trifecta is tomato paste! This deepens the acidic-tomato flavor and creates a thicker consistency.
Homemade Spaghetti Seasoning – This homemade blend is an all-in-one addition to season the sauce. It’s full of traditional flavor and just a hint of sugar for classic spaghetti sauce.
Butter – Add 2 tablespoons of butter at the end for a smooth, luxurious finish. This extra bit of added fat balances the acidity and makes the sauce extra smooth.
Optional: Enhance homemade spaghetti sauce with bits of fresh basil or parsley, grated parmesan, and a big ole’ pot of cooked pasta, ready to serve!

spaghetti sauce ingredients to include tomato sauce, onions, tomatoes, tomato paste, garlic, hamburger, and grated parmesan cheese

How To Make Slow Cooker Spaghetti Sauce

In a 6-quart or larger slow cooker, add uncooked ground beef, chopped onion, garlic, crushed tomatoes, tomato sauce, tomato paste, and spaghetti seasoning.

overhead picture of spaghetti sauce and seasonings

Mix gently to distribute the seasoning and break up the beef slightly. Do not overmix.
Cover and cook on low for 6-8 hours or on high for 3-4 hours.

Stir in 2 tablespoons of butter during the last 10-15 minutes of cook time until melted and well incorporated.

slow cooker with finished spaghetti sauce with wooden spoon and butter

Taste and adjust seasoning if needed.
Spoon over your favorite pasta and garnish with grated parmesan or herbs if desired.

overhead shot of slow cooker with completed spaghetti sauce with bread, basil and tomatoes in background

Pro Tips

Brown the ground beef beforehand if you prefer a finely crumbled texture or want to drain off extra grease. However, it can also be added raw as long as it’s a lean cut.
Use lean beef (93% or leaner) to avoid a greasy sauce.
If the sauce is too runny, let the lid sit ajar during the last 30 minutes of cook time or add another tablespoon of tomato paste.
The slow cooker isn’t ideal for the al dente pasta texture. Cook the noodles separately to avoid overcooking.
Some spaghetti sauce recipes include sugar, but it is not required in this recipe. A small amount of sugar balances acidity from the tomatoes, but the butter also adds smoothness and richness without sugar.

Recipe Substitutions and Variations

Change up a traditional sauce with a few ingredient swaps!

Try adding browned Italian sausage or cooked frozen meatballs for extra protein.
Spice it up by adding red pepper flakes or cayenne pepper for a little kick.
Stir in chopped mushrooms, diced bell peppers, or chopped zucchini at the beginning for a boost of nutrition.
Make every bite of sauce burst with flavor with fresh basil or parsley at the end. Dried herbs can also be used earlier in the cooking process.
Add a layer of richness to the hearty sauce by swapping part of the tomato sauce for beef broth or a splash of red wine.

cooked spaghetti sauce with large wooden spoon

Best Ways To Use Slow Cooker Spaghetti Sauce

Serve a generous helping of spaghetti sauce over your favorite pasta, whether traditional spaghetti, gluten-free pasta, chickpea pasta, or even zucchini noodles! Pair with homemade garlic bread or a simple side salad and garnish with fresh herbs and extra parmesan.

Such a delicious sauce shouldn’t be limited to just pasta! Spoon sauce over grilled chicken for a quick, extra-meaty variation on a chicken parmesan meal. Another option is to serve over Slow Cooker Baked Potatoes for a creative twist!

Also, try using this sauce in these layered pasta dishes:

spaghetti sauce twisted with pasta with two forks on white plate

Storing and Reheating

How To Best Store Leftovers

Fridge

Store leftover meat sauce in an airtight container in the fridge for up to 4 days.

Freezer

Freeze in individual or family-sized portions for up to 3 months. Let the sauce cool completely before freezing, and remember to leave space in the containers for slight expansion.

How To Best Reheat Leftovers

When you’re ready to reheat the sauce, add it to a saucepan over low heat, stirring occasionally, or microwave in 1-minute increments, stirring in between.