Low Carb Keto Spaghetti Sauce (Marinara Pasta Sauce)

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I have so many recipes that call for a keto marinara sauce without added sugar, and while there are store-bought options available, many readers have asked me how to make it at home. So, here it is: The perfect, easy low carb keto spaghetti sauce!

While this sauce is certainly a classic choice for keto pasta or zucchini noodles, there are many other ways to enjoy it beyond just a keto pasta sauce. Keto pizza is a common use for it, but the sauce is cooked, unlike a regular keto pizza sauce. I also have a full list of other uses at the bottom of this post.

Many spaghetti sauces use sugar to balance the acidity from tomatoes. Instead of sugar, I’m using my favorite all-purpose sweetener: Besti Monk Fruit Allulose Blend! Since it measures and tastes like sugar (but contains 0 grams of net carbs), it’s perfect for sauces. Most importantly, it dissolves easily — unlike most substitutes — so your sauce will have no gritty texture.

Jar of low carb spaghetti sauce with Besti monk fruit sweetener.

Is Spaghetti Sauce Keto?

Many spaghetti sauces are not keto friendly, as they have added sugar. Brands without added sugar are fine to use — as is this this keto low carb pasta sauce recipe. Of course, spaghetti itself is high in carbs, but you can serve it over low carb noodle alternatives.

Why This Is My Best Keto Spaghetti Sauce Recipe

  • Slightly sweet and super fresh flavor
  • Chunky texture — or puree to make it smooth
  • Easy to make (just 5 minutes prep)
  • Simple, healthy ingredients
  • Versatile — you can use this in so many ways!
  • Just 3.7 grams net carbs per generous serving (1/4 cup)
  • Healthy, gluten-free, keto-friendly, low carb, paleo, vegetarian, vegan
Keto spaghetti sauce in dutch oven with basil leaf garnish.

Ingredients You’ll Need

This section explains how to choose the best ingredients for keto friendly marinara sauce, what each one does in the recipe, and substitution options. For measurements, see the recipe card below.

  • Olive Oil – I prefer extra virgin olive oil, but regular olive oil or avocado oil are also fine.
  • Onion – I used white onion, but yellow onion will also work. If you want to reduce carbs more, you can substitute about 1 teaspoon of onion powder, to taste (add with the other spices).
  • Garlic – Use fresh garlic for best flavor, or jarred garlic for convenience. You can substitute 1/4 to 1/2 teaspoon of garlic powder, but fresh tastes better.
  • Crushed Tomatoes – These are typically canned or jarred. Make sure there aren’t any added sweeteners or other ingredients. Some brands list only crushed tomatoes, others have a blend of crushed tomatoes and either tomato puree or tomato sauce; any of these should work fine, but you do want crushed tomatoes as one of the ingredients.
  • Besti Monk Fruit Allulose Blend – This is the closest alternative to sugar that will give your sauce subtly sweet flavor without the carbs. Most importantly, it dissolves easily, so there’s no gritty texture. If you have Powdered Besti on hand instead, that’s also fine to use. Other powdered keto sweeteners would work, but they often crystallize when you store them.
  • SpicesItalian seasoning (which is a blend of oregano, marjoram, basil, thyme, rosemary, and sage), sea salt, black pepper, and red pepper flakes.
  • Fresh Basil – I prefer fresh here, but if you need to, you can substitute 2 teaspoons of dried basil in place of the 2 tablespoons fresh.
VARIATIONS: Add meat or veggies!

VARIATIONS: Add meat or veggies!

To make keto spaghetti meat sauce, add ground beef after onions and garlic are done sautéing. Or sneak in some sauteed keto vegetables for more nutrition.

Ingredients to make low carb pasta sauce.

How To Make Keto Pasta Sauce

This section shows how to make keto marinara sauce, with step-by-step photos and details about the technique. For full instructions, see the recipe card below.

  1. Saute. Heat olive oil in dutch oven or pot over medium-high heat. Saute onion and garlic until soft and translucent.
  2. Simmer. Add crushed tomatoes, Italian seasoning, salt, pepper, red pepper flakes (if using), Besti, and chopped basil. Stir together and simmer for 20 minutes.
Dutch oven with sauteed onion and garlic.
Low carb pasta sauce ingredients in a dutch oven.
  1. Season. Add salt and pepper to taste.
  2. Serve. Serve right away (see list of ideas below), or let the sauce cool before storing it in glass jars.
Cooked sugar-free keto marinara sauce close up.

Storage Instructions

  • Store: Keep low carb marinara sauce in glass jars in refrigerator for 3-5 days.
  • Reheat: Reheat the sauce in a saucepan or microwave, until hot.
  • Freeze: Freeze sauce in an airtight container for up to 2-3 months.
Spooning keto pasta sauce over zucchini noodles.

What To Serve With Keto Marinara Sauce

Wondering how to enjoy this homemade keto spaghetti sauce? I’ve got plenty of ideas. I’m sharing the top low carb noodle options below, but I’ve got even more in my keto pasta alternatives article.

Low Carb Noodles:

  • Zucchini Noodles – While sauce is simmering, make zucchini noodles and serve sauce over the top. (Don’t forget the parmesan!)
  • Spaghetti Squash – The baked spaghetti squash is hands off and easy to prep ahead. Serve sauce on the spaghetti squash.
  • Shirataki NoodlesShirataki noodles will be closest to spaghetti, but you have to cook them correctly! Be sure to follow the outlined steps.
  • Keto Egg Noodles – If you love chewy, thicker pastas like linguine or fettuccine, keto egg noodles are a delicious option.

More Ways To Use Low Carb Marinara:

More Easy Low Carb Pasta Sauce Recipes

If you like this low carb spaghetti sauce recipe, you might also like some of these other sauce recipes:

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Tap on the times in the instructions below to start a kitchen timer while you cook.

  1. Heat the olive oil in a Dutch oven over medium-high heat. Add the onion and garlic and saute for 3-4 minutes, until the onion is translucent.

  2. Add the crushed tomatoes, Italian seasoning, salt, pepper, red pepper flakes (if using), Besti, and chopped fresh basil. Stir until combined.

  3. Simmer the keto marinara sauce over medium-low heat for 20 minutes.

  4. Adjust salt and pepper to taste, if needed.

  5. Serve immediately, or let the sauce cool completely before storing it in glass jars in the refrigerator.

Recipe Notes

Serving size: 1/4 cup

Makes about 3 cups.

Nutrition Facts

Amount per serving. Serving size in recipe notes above.

Calories 63

Fat 4.5g

Protein 1.1g

Total Carbs 4.9g

Net Carbs 3.7g

Fiber 1.2g

Sugar 2.2g

Nutrition facts are provided as a courtesy. Have questions about calculations or why you got a different result? Please see our nutrition policy.

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