Crockpot Roasted Vegetable Sauce

Hi Friends!

Today I have a fun sauce recipe to share with you. Crockpot Roasted Vegetable Tomato Sauce.

An easy way to add some extra vegetables to your meal, this Crockpot Roasted Veggie Tomato Sauce is super simple and easy to customize based on what you have on hand.

Let’s talk about spaghetti sauce for a minute. I love it…I don’t love how much salt is usually in it. A few years ago I started buying no-salt-added crushed tomatoes and adding my own garlic and herbs to make spaghetti sauce. It’s super easy and much healthier!

Another one of my favorite tricks for making sauce healthier is to add extra veggies. Usually I just chop them up, saute them and mix them into my sauce with some lentils and then serve over noodles. This weekend, however, I was in the mood for a less chunky sauce. So I turned to my crockpot.

An easy way to add some extra vegetables to your meal, this Crockpot Roasted Veggie Tomato Sauce is super simple and easy to customize based on what you have on hand.

Let’s back up a minute. Did you know you can roast veggies in your crockpot? It’s so easy. Just chop up some veggies of your choice, toss lightly with olive oil and spices of your choice and roast in the crockpot on high for 3-4 hours or on low for longer. The veggies will get a little softer than when you roast them in the oven and not as “blackened”, but the flavor is still great. I still have a slight preference for oven roasted veggies…but using the crockpot is a fun way to change it up.

Ok, moving on. I decided to use some crockpot roasted veggies to kick my spaghetti sauce up a notch. Here’s what I did:

  • Chopped up some veggies I had on hand and some garlic.
  • Tossed in olive oil and roasted in the crockpot on high for 3 hours, stirring every hour.
  • Added 2- 28oz can of whole  tomatoes, one with liquid and one drained (you could also use 4- 14.5 oz cans of no salt added diced tomatoes, or even crushed)
  • Pureed the mixture using my immersion blender.
  • Added some spices and fresh herbs.
  • Let simmer for a couple more hours.

Voila! Roasted Veggie Sauce. The best part is you can freeze this sauce….so use some now and freeze the rest. When you need more, just pull it out and defrost it! There isn’t an exact recipe for this sauce but here’s the general idea:

Serves 6-8

Crockpot Roasted Vegetable Sauce

This sauce is a cinch to make and a great way to sneak more veggies into your diet. Enjoy some today and freeze the rest for tomorrow!

5Prep Time

5 hrCook Time

5 hr, 5Total Time

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Crockpot Roasted Vegetable Sauce


2-3 cups chopped vegetables
2 28-oz cans whole tomatoes
2-3 tsp oregano
2 Tbsp fresh basil
3-4 cloves garlic, minced


  1. Peel and roughly chop the vegetables. Use whatever you have on hand. I used a sweet potato, a red pepper, 2 leeks, a handful of mushrooms and 3-4 carrots.
  2. Toss lightly in olive oil and add to the crockpot with the garlic.
  3. Roast on high for 3-4 hours or until soft, stirring every hour.
  4. Add one can of tomatoes with liquid, the drain the second can and add it without the liquid.
  5. Use an immersion blender or transfer to a blender and puree until smooth.
  6. Add spices (adjust to your tastebuds- add parsley or other italian seasonings if desired).
  7. Let simmer 1-2 hours more on warm.
  8. Store in an airtight container in the fridge or freeze.


You won’t outright taste the veggies, but it’s awesome knowing that they’re in there…and I think it adds a nice flavor to the sauce if you’re looking for it. Try to find no-salt-added tomatoes if you can! If you can’t, look at several brands to find the one with the lowest amount, and rinse off the tomatoes from the can you drain the liquid from!

crockpot roasted vegetable sauce

Serve this sauce over noodles or spaghetti sauce and add your favorite protein. I usually add lentils or white beans…but you could also add chicken or ground turkey.  And if you’re feeling extra “saucy”, add a dollop of pesto for some extra flavor!

An easy way to add some extra vegetables to your meal, this Crockpot Roasted Veggie Tomato Sauce is super simple and easy to customize based on what you have on hand.

Let’s chat: Do you add extra veggies to your sauce?



About Lindsay

Lindsay Livingston is a Registered Dietitian and new mom from Columbus, Ohio. On her blog, she shares simple, healthy recipes, nutrition tips, workouts and snapshots of her life. Follow her on Twitter @LeanGrnBeanBlog and Instagram @TheLeanGreenBean and be sure to subscribe via RSS or email so you never miss a post!


  1. What a great idea! Plus it looks super tasty and I’m sure tastes just as good, if not BETTER than the jarred stuff!
    Katie @ Talk Less, Say More recently posted..Chi Town 10k Race Recap

  2. i love sneaking in veggies – there’s no reason not to! it bulks up the sauce and adds nutrition!!
    Linz @ Itz Linz recently posted..# 99 WORKOUT

  3. Oh my goodness, that looks so good!

  4. Sounds wonderful. I actually have to do what you said, and mix no-salt added crushed tomatoes with my own spices, in order to have a sauce without garlic and onion! I don’t mind it (I add garlic olive oil).
    The Candid RD recently posted..Basil and Lemon Iced Beverage (Motivational Monday)

  5. I’ve never thought to roast veggies in a crockpot. Great tip–thanks! I agree that making your own sauce is the way to go. Not only for the salt content, but some companies add sugar (or HFCS) as well. Why is that necessary? Annoying.
    Michelle @ Eat Move Balance recently posted..Vegan Lentil Burgers

  6. Looks delicious! I add veggies to everything! I love adding sauteed, chopped eggplant to spaghetti sauce as a meat substitute. :)
    Maureen recently posted..This is MY Journey

  7. Millie Jones says:

    I feel like spaghetti is one of the easiest ways to add veggies!!! It helps bulk up the meal and adds great nutrients. I love adding veggies to lasagna and I even like to switch out crumbled tofu for the ricotta! Another wonderful swap!

  8. I too never thought of roasting veggies in a crockpot! Genius! Thanks for this.
    Christine @ Love, Life, Surf recently posted..How to watch a surf contest

  9. Oh smart idea on the crockpot. Duh, never thought to do that even though I simmer my sauce for hours. LOL
    Heather (Where’s the Beach) recently posted..What’s in Your Fitenss Closet?

  10. I love making my own sauce! Thanks for the inspiration!
    Sara@fitcupcaker recently posted..WOD Addiction Clothing Review & Giveaway

  11. I love Crock Pot recipes. I love to use my Crock Pot, they make my life so easy! That looks good!!!Thanks for sharing this recipe! :)
    Ja @Athlete Within Ja recently posted..Spring, Where Are You?

  12. This looks yummy & anything in the crockpot is worth trying because it’s so darn easy!
    Haley @ fullnfit recently posted..Mint Chocolate Chip Protein Shake

  13. I love making my own tomato sauce! I almost always prefer it ‘chunkier’ though. I haven’t bought canned tomato sauce like Prego in ages
    Alysia @ Slim Sanity recently posted..Paleo Spaghetti Squash Casserole

  14. What a great idea, Lindsay! This looks delish! It’s a great way to sneak in some veggies. =)
    Helen recently posted..Peanut Butter Agave Protein Balls

  15. You rule Lindsay! We both shared and created to very awesome spaghetti squash meals this week. How funny! Good to now great minds think alike. I can’t wait to try yours. I love how you made your sauce!! xx
    Moni Meals & Fitness recently posted..HomemadeTomato Sauce-Spaghetti Squash Meal

  16. What a great idea, I am always looking for new ways to use my crockpot! Thanks :)
    Kelly @ Cupcake Kelly’s recently posted..Year of Baking: Bake It In A Cake’s Halloween Brownies with Reese’s Pieces.

  17. Yum! I definitely want to use my crock pot more. So many easy recipes! I’ve never made my own sauce but it seems super simple! I’ve got a spaghetti squash waiting to be tried!
    Leigha recently posted..A Marvelous Ending

  18. Just went to heaven for a little bit… Your Tomato Sauce was there 😀

  19. I think you may just be better at sneaking in veggies than anyone I know! This sauce looks fab :)
    Alexis @ Hummusapien recently posted..Every Moment Is a Gift

  20. This looks awesome and the perfect way to get my kids to eat more vegetables :)
    Jen@HealthyFoodandFamily recently posted..Weekly Weigh In {3.15.13}

  21. Stomach is growling…looks so good and there are so many ways to use something like this!

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  22. This looks awesome! I never knew you could roast veggies in a crockpot either! I love making my own pasta sauce, although I’ve never done it in a crockpot before.
    Becky @ Olives n Wine recently posted..Peanut Butter Blossoms

  23. Adding this to my list of recipes to try! Sounds delicious – I love adding veggies into sauces, it adds flavor and nutrition – win!
    Lindsay @ Live. Love. Nutrition. recently posted..7 Hilly Miles and A Whole Foods Lunch

  24. That looks so tasty! and healthy to!!
    Tanya recently posted..The Best WordPress Anti-Spam Plugins for 2012-2013

  25. I LOVE homemade sauce, and the crockpot is a great idea! Totally pinning this! Had no idea about roasting veggies in the crock too! no liquid? does it make them burn??
    jobo recently posted..Becoming a reality…

    • they might burn if you didn’t stir them…but the veggies release their moisture while they’re in there so there actually ends up being some liquid in there which helps them not burn!

  26. Morganne @ Nut Butter Runner says:

    I always add veggies to my sauce! They add so much more flavor, nutrients, and make it more hearty! :)

  27. Lindsay, this looks great! What an awesome way to get in extra veggies, and add some flavor to the sauce. I love the taste of roasted veggies, and I bet it makes the sauce extra delicious!
    Ari @ Ari’s Menu recently posted..Drink & Dish: Lemon Almond Meal Scones {with video}

  28. I love this idea…and am ALL ABOUT more veggies! Will be trying this stat – to top my spaghetti squash with :)
    Kelly @ Nosh And Nourish recently posted..I Love Spring + {Bird’s Nest Cookies}

  29. I love this and I can’t wait to try it. I already add purreed carrots to my spaghetti courtesy of Giada de Lerentis. So, I am so in to adding all this other stuff. Plus, one time I added eggplant. It was yummy.
    kristi recently posted..Running With the Luck of the Irish

  30. Why have I never thought of this before?! This is awesome. Thanks so much for sharing. Making this ASAP!! :)
    Megan @ The Delightfull Dash recently posted..Springtime Snow and Jumping High

  31. I LOVE adding tons of veggies to my tomato sauces, especially because I love super think and chunky sauce.

    I had no idea you could ‘roast’ veggies in a slow cooker. Not that I’ve ever USED my slow cooker…
    Sarah @ The Smart Kitchen recently posted..Cutting (The Calorie Counting) Out [Update+WIAW]

  32. Beautiful sauce. What great way to add nutrients and extra flavor!
    Nutmeg Nanny recently posted..Spinach Artichoke Bread


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