Slow Cooker Tomato Butter Sauce


5 Comments


This post may contain affiliate links. Please read our disclosure policy.

Slow Cooker Tomato Butter Sauce is the perfect concoction of canned tomatoes, white onion, and a medley of seasonings that simmer together to create a sauce that’s both tasty and versatile. Whether you’re tossing it with pasta, drizzling it over grilled veggies, or using it as a pizza base, this sauce is sure to become a staple in your meal planning.

Stock your freezer (or pantry) with a variety of sauces using my Slow Cooker Spaghetti Sauce and Vegetarian Slow Cooker Spaghetti Sauce recipes.

slow cooker tomato butter sauce on a wooden spoon.
Save Recipe
Save this recipe!
Get this sent to your inbox, plus get new recipes from us every week!
Please enable JavaScript in your browser to complete this form.

Why This Tomato Sauce Recipe Works

What’s not to love about a recipe that practically cooks itself? With the magic of a crockpot, this tomato butter sauce requires minimal effort, making it perfect for busy cooks. Simply dump in the ingredients and let the slow cooker work its magic while you go about your day.

Plus, the slow cooking process allows the flavors to meld together beautifully, resulting in a sauce that’s bursting with delicious flavors. And let’s not forget about the versatility – from pasta to pizza to grilled meats, this sauce pairs perfectly with just about anything.

This is such a simple recipe that can easily become your new marinara sauce using just a few ingredients. The perfect recipe for a simple sauce – yes please!

Recipe Ingredients

ingredients for slow cooker tomato butter sauce on a table.
  • Canned Tomatoes: Canned peeled tomatoes provide the base for this sauce, offering convenience without sacrificing flavor.
  • Onion: Adds depth and sweetness to the sauce as they slowly cook down.
  • Butter: Salted butter always enhances whatever it’s added to and in the case of this sauce, it adds to it’s creaminess. (You can also use unsalted butter.)
  • Seasonings: A combination of kosher salt, Italian seasoning, and garlic powder adds layers of flavor to the sauce.

Step-by-Step Directions

two images showing how to make slow cooker tomato butter sauce.

Step One – Add everything to the slow cooker.

Step Two – Cover and cook on LOW for 6 hours or on HIGH for 4 hours. Stir once if you are home to incorporate the butter into the sauce. To serve, take a potato masher (or back of a wooden spoon) and crush the tomato mixture. You can serve this with or without the onions if desired. Enjoy!

overhead shot of tomato butter sauce in a slow cooker.

How to Serve

  • Toss this tomato butter sauce with al dente spaghetti or your favorite pasta for a comforting tomato butter pasta meal that’s ready in minutes.
  • Use this sauce as a base for homemade pizza, spreading it over a pre-baked crust and topping with your favorite cheese and toppings for a deliciously gourmet pie.
  • Drizzle this sauce over roasted vegetables or grilled eggplant or spoon this sauce over grilled chicken or shrimp for a quick and easy weeknight dinner.
  • Serve this sauce alongside crusty bread for a simple yet satisfying appetizer that’s perfect for sharing. Don’t forget to top it with fresh basil, olive oil, and red pepper flakes.
overhead of pasta with slow cooker tomato butter sauce.

Recipe FAQs

Can I use fresh tomatoes instead of canned?

Absolutely! If you have an abundance of garden tomatoes or prefer the flavor of fresh, simply add your tomatoes to the slow cooker after peeling.

How should I store leftovers?

Store any leftover sauce in an airtight container in the refrigerator for up to 5 days, or freeze it for longer storage.

Can I reheat frozen sauce?

Yes, simply thaw the sauce in the refrigerator overnight and reheat it gently on the stovetop over low heat, stirring occasionally until warmed through.

Can I make this sauce ahead of time?

Definitely! This sauce actually tastes even better the next day as the flavors have had time to mingle, so feel free to make it in advance and reheat it when ready to serve.

pasta topped with slow cooker tomato butter sauce on a plate.

More Slow Cooker Sauce Recipes

Want to make more magic in your crockpot? Stay up to date and subscribe to my newsletter and follow along on FacebookInstagramPinterest, Tik Tok, and YouTube.

overhead shot of tomato butter sauce in a slow cooker.

Slow Cooker Tomato Butter Sauce

3.50 from 2 votes
Prep Time: 5 minutes
Total Time: 6 hours 5 minutes
Servings: 6
You're just 6 ingredients and a crockpot away from whipping up a delicious homemade batch of Slow Cooker Tomato Butter Sauce.

Ingredients  

  • 56 oz. canned whole tomatoes, (two 28 oz. can tomatoes)
  • ½ cup salted butter, (one stick)
  • 1 white onion, peeled and quartered
  • 1 tsp. garlic powder
  • tsp. salt
  • 2 tsp. Italian seasoning

Serving ideas

  • serve on ravioli or noodles

Instructions 

  • Add everything to the slow cooker.
  • Cook on low for 6 hours or on high for 4 hours. Stir once if you are home to incorporate the butter into the sauce.
  • To serve, take a potato masher (or back of a wooden spoon) and crush the tomatoes. You can serve this with our without the onions if desired.
  • Serve over your favorite pasta.

Sarah’s Notes

  • Nutritional Values do not include pasta.
  • Fresh tomatoes can be used instead of canned, though you will want to peel them. Do this by dropping in boiling water, remove and the skin should come right off.
  • Store any leftover sauce in an airtight container in the refrigerator for up to 5 days, or freeze it for longer storage.

Nutrition

Calories: 191kcal | Carbohydrates: 13g | Protein: 3g | Fat: 16g | Saturated Fat: 10g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 1g | Cholesterol: 41mg | Sodium: 1083mg | Potassium: 543mg | Fiber: 3g | Sugar: 7g | Vitamin A: 794IU | Vitamin C: 26mg | Calcium: 102mg | Iron: 3mg

Nutrition info is auto-generated. This information is an estimate; if you are on a special diet, please use your own calculations.

Made this recipe? Leave a comment below!

Other recipes you may like

Leave a comment

Your email address will not be published. Required fields are marked *

Recipe Rating




5 Comments

  1. Walter G. says:

    Since you mentioned “easy”, why not 2 cans of Pureed Tomatoes? Save time by not having to attack it with a potato masher.
    Also, would this work with meatloaf or too buttery?

    1. Sarah Olson says:

      You could use pureed tomatoes; I like it a little chunky though. I think this would be good with meatloaf!

  2. Barbara says:

    4 stars
    Couldn’t the onions be quartered and thickly sliced?

    1. Sarah Olson says:

      Yes, pretty much any way would work great.

  3. Lynn says:

    3 stars
    I want MEAT with my.pasta so will include at least a pound of ground Beef or Pork….plus about 6 additional spices. And WHY whole tomatoes? Why not diced or sliced?