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Slow Cooker Tomato Parmesan Soup

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the soup that basically raised me

There’s something about this soup that just feels like home.

I’ve been eating Tomato Parmesan Soup since I was a kid—like, we’re talking elementary school lunchbox in one hand, grilled cheese in the other level obsession. It was my mom’s thing. And honestly? Still kind of my thing. There’s just something magical about tomatoes that have been simmering for hours, soaking up garlic, onion, and all those cozy Italian spices, then getting all creamy and cheesy and just… perfect.

Even now, it’s one of those recipes I go back to when I don’t know what to make, when life’s a little too loud, or when it’s cold outside and I want to feel hugged by something edible. You know?

Let’s get into it.

Why You’ll Keep Coming Back to This One

  • It’s stupid easy. You throw it in the slow cooker and let it do its thing. That’s it.

  • The flavor? Way more impressive than it should be. It tastes like you spent hours stirring it on the stove (spoiler: you didn’t).

  • It feeds a crowd, or just… you for four days straight. No judgment.

  • It’s the kind of soup that wants to be eaten with bread. Crusty, buttery, slightly burnt? Yes please.

Stuff You’ll Need (And What to Do If You Don’t Have It)

Let’s talk ingredients. Not in a boring list kind of way, but the real-life way:

  • Crushed tomatoes: Two big cans. Use good ones if you can (San Marzano is fancy but any brand works). I’ve used store-brand dozens of times and lived to tell the tale.

  • Onion + garlic: Start everything here. You’re building flavor. Don’t skip the sauté unless you’re truly out of energy, in which case… I get it.

  • Broth: Veggie or chicken. Boxed, homemade, bouillon cube—whatever works.

  • Heavy cream: This is where the soup gets rich and cozy. Half-and-half works too. You could even use a splash of milk in a pinch, but you’ll lose a little velvetiness.

  • Parmesan cheese: Fresh grated is best, but honestly? I’ve used the bagged kind more than once. Just don’t use the stuff in the green can. Please.

  • Olive oil, oregano, basil, sugar: Pantry staples. The sugar’s just a tiny bit to cut the tomato’s acidity—not enough to make it sweet, promise.

  • Salt & pepper: Taste as you go. Parmesan adds salt too.

  • Optional basil on top: Only if you’re feeling fancy or trying to impress someone (even if that someone is yourself).

Let’s Make It, Step-by-Step

(with the kind of instructions that feel like a friend texting you)

1. Get the good smells going

Heat up your olive oil in a skillet over medium heat. Toss in the chopped onion and cook until it’s soft and kind of golden around the edges—like, 5-ish minutes. Add garlic. Stir until your kitchen smells like an Italian grandma moved in.

2. Dump it all in the slow cooker

Scoop the onions and garlic into the slow cooker. Add your crushed tomatoes, broth, dried oregano and basil, and sugar. Stir it up like you’re making a potion.

3. Walk away

Put the lid on. Set it to low for 6–8 hours or high for 3–4. Go about your life. Work, nap, scroll TikTok, fold laundry (or don’t). Just let it do its thing.

4. Blend time

About 30 minutes before you’re ready to eat, grab an immersion blender and blend it right in the pot until it’s smooth. Or leave some chunks if you like texture. No immersion blender? Carefully do it in batches in a regular blender (and don’t fill it too high—learned that one the hard way).

5. Make it creamy & cheesy

Stir in the heavy cream and Parmesan cheese. Let it heat up for another 15–20 minutes. Taste it. Maybe cry a little because it smells so good.

6. Taste & tweak

More salt? A little black pepper? A few red pepper flakes if you’re spicy like that? Make it yours.

7. Serve it up

Ladle into bowls. Sprinkle with basil if you’re feelin’ cute. Serve with something carby—baguette, garlic bread, grilled cheese, even a pile of crackers. Whatever makes you happy.

Want to Shake Things Up? Here’s How.

  • Vegan vibes? Use full-fat coconut milk instead of cream and swap Parmesan for nutritional yeast. Still creamy, still dreamy.

  • Add protein: Shredded rotisserie chicken or cooked sausage goes in great during the last hour.

  • Toss in some roasted red peppers: Blend them in with the tomatoes for a smoky twist.

  • Spinach at the end: Stir in a handful right before serving. It wilts perfectly and adds a little green.

What About Leftovers?

Honestly? It tastes better the next day. Something about the flavors chilling overnight just makes it extra.

  • Fridge: Good for 4–5 days. Reheat in the microwave or on the stove. Stir it around, add a splash of cream or broth if it thickened too much.

  • Freezer: Yup. Freeze in portions, thaw in the fridge overnight, reheat gently. It’s freezer gold.

Alright, That’s the Soup

That’s the one. The soup I’ve been loving since I had bangs and Lisa Frank folders. The one I still make when the weather turns or when I just want something that makes me feel grounded and full and okay.

If you make it, I’d love to know. Tell me if you added anything weird that turned out amazing. Or if you burnt the garlic but made it work anyway. Or if your picky eater kid loved it. Seriously. We’re all just doing our best out here.

Stay warm. Eat good soup. Talk soon.

Slow Cooker Tomato Parmesan Soup

A creamy, comforting soup made easy in the slow cooker. This tomato Parmesan soup combines rich crushed tomatoes, aromatic herbs, and a luxurious blend of cream and cheese. Perfect for chilly days and lazy weeknight dinners.
Prep Time 10 minutes
Cook Time 8 hours
Total Time 8 hours 10 minutes
Course Comfort Food, Slow Cooker, Soup
Cuisine American
Servings 6 servings
Calories 320 kcal

Ingredients
  

  • 2 28-ounce cans of crushed tomatoes
  • 1 medium onion finely chopped
  • 3-4 cloves garlic minced
  • 4 cups vegetable or chicken broth
  • 1 cup heavy cream
  • 1 cup grated Parmesan cheese
  • 2 tbsp olive oil
  • 1 tsp dried oregano
  • 1 tsp dried basil
  • 1 tsp sugar
  • salt and pepper to taste
  • fresh basil chopped, optional for garnish

Instructions
 

  • In a skillet, heat the olive oil over medium heat and sauté the chopped onion until translucent, about 5 minutes. Add the minced garlic and cook for another 1-2 minutes until fragrant.
  • Transfer the sautéed onions and garlic to your slow cooker. Add the crushed tomatoes, vegetable or chicken broth, dried oregano, dried basil, and sugar.
  • Stir everything together until well combined. Cover and cook on low for 6-8 hours or on high for 3-4 hours.
  • About 30 minutes before serving, use an immersion blender to purée the soup until smooth. If you prefer a chunkier texture, you can purée only half of it.
  • Stir in the heavy cream and grated Parmesan cheese. Continue to cook for another 15-20 minutes until the cheese has melted and the soup is heated through.
  • Taste and adjust seasoning with salt and pepper as needed.
  • Serve hot, garnished with chopped fresh basil if desired.

Notes

For extra richness, add a splash of white wine before slow cooking or serve with a grilled cheese sandwich on the side.

Nutrition

Calories: 320kcal
Keyword crockpot, easy dinner, parmesan, slow cooker, tomato soup
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