There’s just something magical about tomato soup simmering all day in the slow cooker — the smell alone feels like a warm hug. I first made this Tomato Parmesan Soup on a chilly evening when I wanted something comforting but didn’t have the energy for a big meal. By dinnertime, the whole kitchen smelled amazing — rich tomatoes, garlic, basil, and that cozy hint of Parmesan.
It’s creamy, cheesy, and just the right amount of hearty. I like to serve it with a grilled cheese sandwich for dipping or some warm garlic bread on the side. The best part? It takes just a few minutes to throw everything in the slow cooker, and by the time you’re ready to eat, you’ve got a restaurant-worthy soup that tastes like it’s been cooking all day (because it has!).
Ingredients
1 (28 oz) can crushed tomatoes
1 (14 oz) can diced tomatoes
1 cup finely diced onion
2 cups chicken or vegetable broth
1 tablespoon minced garlic
1 teaspoon dried basil
½ teaspoon dried oregano
½ teaspoon salt
¼ teaspoon black pepper
½ cup grated Parmesan cheese
1 cup half-and-half or heavy cream
3 tablespoons butter
2 tablespoons flour (optional, for thickening)
Fresh basil or extra Parmesan, for topping
Instructions
Add crushed tomatoes, diced tomatoes, onion, broth, garlic, basil, oregano, salt, and pepper to your slow cooker. Stir well.
Cover and cook on Low for 6–7 hours or High for 3–4 hours, until onions are tender.
Blend the soup with an immersion blender if you want it smooth.
In a small saucepan, melt butter over medium heat. Whisk in flour (if using), then slowly add the half-and-half. Stir in Parmesan until melted and creamy.
Add the creamy mixture to the slow cooker and stir. Cook on Low for 15–20 minutes more.
Serve with fresh basil or more Parmesan.
Note:
This soup is super flexible! You can use half-and-half, cream, or even milk for a lighter version. For extra flavor, stir in a little garlic powder or crushed red pepper flakes. Leftovers taste even better the next day, and you can top each bowl with croutons, a drizzle of olive oil, or extra Parmesan for a restaurant-style touch. Perfect for meal prep or a cozy weeknight dinner!
