I've been making spaghetti sauce in big batches for years because if I'm going to chop an onion, I might as well get more than one dinner out of it. This slow cooker spaghetti sauce simmers all day with tomatoes, garlic, vegetables, and plenty of Italian herbs until it's rich, thick, and tastes like somebody's been fussing over it for hours. I leave the meat out on purpose, then freeze it in recipe sized portions so I can add ground beef, sausage, meatballs, or nothing at all depending on what dinner looks like that night. Future me is always incredibly grateful.
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🥰 Is this slow cooker spaghetti sauce recipe for you?
This is the sauce to make if you:
- Enjoy saving money without sacrificing time or taste.
- Want a big batch of homemade spaghetti sauce without babysitting a pot on the stove all afternoon.
- Like having homemade sauce tucked away in the freezer for nights when dinner needs to happen with very little discussion.
- Want a meatless base that gives you options. Add ground beef, Italian sausage, or meatballs later, or leave it exactly as it is.
- Prefer spaghetti sauce with lots of garlic, Italian herbs, and vegetables rather than something that tastes like tomatoes politely waved at an oregano plant.
- Need to sneak a respectable amount of vegetables into dinner without making an announcement about it.
- Appreciate a recipe that can be made the traditional way or streamlined with a food processor when chopping vegetables sounds like an unreasonable demand.
Basically, you make one Crockpot full now and stash several future dinners in the freezer. That's the kind of math I can get behind.
🧾 Ingredients
Here's everything you'll need to make a big batch of rich, slow-simmered spaghetti sauce, plus a few notes to help you get the best flavor.
- Olive oil - Just enough to sauté the vegetables and get a little extra flavor going before everything heads into the slow cooker.
- Carrots - Finely dice these so they practically disappear into the finished sauce. They add natural sweetness and help tame the acidity of the tomatoes.
- Onion - I use a good amount because spaghetti sauce without plenty of onion feels like it has trust issues.
- Celery - Adds savory depth without making the sauce taste like celery. Dice it finely and nobody needs to know it's there.
- Bell peppers - Use green, red, or whatever you have lurking in the vegetable drawer. Green gives the sauce a slightly more savory, old-school Italian-American flavor.
- Garlic - Six cloves, because we are making spaghetti sauce, not preparing for a first date with a vampire.
- San Marzano whole peeled tomatoes - These bring great tomato flavor and break down beautifully during the long, slow cooking time. Crush them with your hands or a spoon before cooking.
- Crushed tomatoes - Give the sauce body and that thick, saucy texture we're after.
- Tomato sauce - Smooths everything out and helps create a rich sauce without needing tomato paste.
- Dried oregano - There's a generous amount here on purpose. Eight hours in the slow cooker gives those dried herbs plenty of time to settle in and make themselves at home.
- Italian seasoning - An easy way to layer in basil, oregano, and the other usual suspects without emptying half the spice cabinet onto the counter.
- Garlic powder - Yes, there's fresh garlic too. They bring different flavors to the party, and I see no reason to make garlic choose.
- Salt - Start with the amount in the recipe, then taste and adjust once the sauce has finished cooking.
- Black pepper - Adds just a little bite to balance all those tomatoes and herbs.
- Brown sugar - Optional, and this is definitely a taste-before-you-add ingredient. If the finished sauce is more acidic than you like, add a little at a time until the flavors balance. This is spaghetti sauce, not tomato jam.
📖 Recipe
Slow Cooker Spaghetti Sauce
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- 1 tablespoon olive oil
- 2 cups onion, diced
- 1 cup carrots, finely diced
- 1 cup celery, finely diced
- 1 cup bell peppers, diced
- 6 cloves garlic, minced
- 25 ounces San Marzano whole peeled tomatoes
- 25 ounces crushed tomatoes
- 25 ounces tomato sauce
- 3 tablespoons dried oregano
- 2 tablespoons Italian seasoning
- 1 ½ teaspoons garlic powder
- 1½ teaspoons kosher salt, plus more to taste
- 1 teaspoon black pepper
- 4 tablespoons brown sugar, optional
Instructions
- Heat the olive oil in a large skillet over medium heat. Add the onion, carrots, celery, and bell pepper. Cook for 7 to 10 minutes, stirring occasionally, until the vegetables have softened and the onion is translucent.
- Add the minced garlic and cook for about 30 seconds, just until fragrant. Don't brown it.
- Transfer the vegetables to a 6-quart slow cooker.
- Add the San Marzano tomatoes, crushed tomatoes, tomato sauce, oregano, Italian seasoning, garlic powder, salt, and pepper. Crush the whole tomatoes with your hands as you add them, or break them up with a wooden spoon once they're in the Crockpot.
- Stir everything together. Cover and cook on LOW for 8 hours.
- Stir well and taste. Adjust the salt and pepper. Only add the brown sugar if the tomatoes still taste more acidic than you want, starting with a tablespoon.
- Check the consistency. If it's thinner than you want, remove the lid and cook on HIGH for 30 to 60 minutes, stirring occasionally, until it reaches the consistency you like.
Notes
- You can add cooked ground beef or Italian sausage to the slow cooker if you want. I prefer to leave it out so I can use it in a variety of dishes.
- An 8 ounce can of tomato paste will make it even richer and thicker but it's not necessary.
Nutrition Facts
Nutrition information is estimated as a courtesy. If using for medical purposes, please verify information using your own nutritional calculator. Percent Daily Values are based on a 2000 calorie diet.
This recipe has been tested several times. If you choose to use other ingredients, or change the technique in some way, the results may not be the same.
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🔪 If you used a food processor
If you used a food processor to mince the vegetables you'll want them to look something like this. If you need one this Ninja Pro Plus food processor is a great value.
😱 What can go wrong (and how to fix it)
Even spaghetti sauce can wake up and choose chaos. Luckily, most problems are easy to fix.
🍅 The sauce is too thin. Slow cookers hold on to moisture like it's a family heirloom. Remove the lid and cook on HIGH for 30 to 60 minutes, stirring occasionally, until the sauce thickens.
🍅 The sauce tastes too acidic. Give it the full cooking time first because the tomatoes will mellow as they cook. If it's still too sharp at the end, stir in brown sugar a teaspoon at a time until the flavor is balanced the way you like it.
🍅 The sauce is too sweet. This is why we taste before adding the brown sugar. If you've already crossed that bridge, add a little more crushed tomato or tomato sauce, plus a pinch of salt, to bring things back into balance.
🍅 The vegetables are still too chunky. Finely diced vegetables should soften considerably during the long cooking time, but if you want a smoother sauce, give it a few quick pulses with an immersion blender. Don't completely purée it unless that's the texture you like.
🍅 The sauce tastes flat. It probably needs salt rather than another fistful of herbs. Add a little salt, stir well, wait a few minutes, and taste again before adjusting anything else.
🍅 The herbs taste too strong. Dried herbs can vary quite a bit in strength. If yours have staged a hostile takeover, add a little extra tomato sauce or crushed tomatoes and let everything cook together for another 20 to 30 minutes.
👩🏻🍳 FAQs
Absolutely. I prefer to make and freeze the sauce without meat because it gives me more options later. When you're ready to use it, brown ground beef or Italian sausage and stir it into the reheated sauce, add meatballs, chicken for cacciatore, or leave it meatless. One batch of sauce, lots of different dinners.
Homemade spaghetti sauce will keep well in the freezer for about 3 months when stored in airtight, freezer-safe containers or freezer bags. Let it cool completely before freezing, and leave a little room for expansion if you're using containers. I like freezing it in meal-size portions so I can thaw exactly what I need instead of defrosting enough sauce to cater an Italian wedding.
🍽 Ways to use homemade spaghetti sauce
A big batch of spaghetti sauce gives you plenty of options beyond, well, spaghetti. Use it with your favorite pasta, spoon it into a casserole, or use it for pizza or soups.
🏡 This big batch slow cooker spaghetti sauce is one of those recipes that makes life a little easier every time you find a container of it in the freezer. Keep it meatless, dress it up differently every time, and use it for everything from spaghetti and meatballs to lasagna and casseroles. It's basically dinner waiting patiently for you to get your act together, which is more than I can say for most things.
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