Creamy Tomato Basil Soup with Grilled Cheese Croutons is a perfect bowl of comfort on a chilly day. The soup feels silky and smooth with a rich tomato flavor balanced by fresh, fragrant basil. The grilled cheese croutons add a fun twist—crispy, cheesy little bites that soak up the soup’s creaminess.
I love making this soup when I want something simple but special. The creamy texture makes it feel like a treat, but the ingredients are straightforward and easy to find. Adding grilled cheese croutons is my favorite part because they bring a bit of nostalgia and a satisfying crunch to every spoonful.
My go-to way to enjoy this is sitting cozy with a warm bowl and a good book or sharing it with friends during a lazy weekend lunch. It feels like a big hug in a bowl, and those cheese croutons make it playful enough to keep everyone smiling. If you like, you can try adding a little extra basil on top for a fresh pop of flavor.
Key Ingredients & Substitutions
Tomatoes: Whole peeled canned tomatoes are great for deep flavor and texture. If you want fresher taste, use ripe fresh tomatoes, but canned is easier and consistent.
Basil: Fresh basil is best for brightness. If you can’t find fresh, dried basil works, but add less since it’s more concentrated.
Heavy Cream: This makes the soup rich and smooth. For a lighter option, use half-and-half or coconut milk, but the soup will be less creamy.
Bread for Croutons: Rustic or sourdough bread holds up well when grilled. Any sturdy bread will work, but avoid soft sandwich bread that can get soggy.
Cheese: Sharp cheddar is classic and melts nicely. Mozzarella or a cheese blend also works well. If dairy-free, use a vegan melting cheese.
How Can I Make Perfectly Smooth, Creamy Soup Without Chunky Bits?
Getting a silky soup texture is key here. Use one of these steps:
- Use an immersion blender directly in the pot for easy, quick pureeing.
- If using a regular blender, work in small batches to avoid spills and blend until smooth.
- For extra smooth texture, pass the blended soup through a fine mesh sieve or strainer.
- Always be careful with hot liquids in the blender—vent the lid slightly to release steam or blend in short bursts.
- Finish the soup gently by heating after adding cream, but avoid boiling to keep cream from curdling.
Equipment You’ll Need
- Large pot – I use this so I can cook everything in one place without making a mess.
- Immersion blender or regular blender – this makes the soup smooth and creamy, which I love.
- Skillet – handy for grilling the cheese sandwiches until golden and melted.
- Cutting board and knives – for chopping onions, garlic, and basil easily.
- Spatula or wooden spoon – perfect for stirring the soup and crushing tomatoes.
Flavor Variations & Add-Ins
- Swap the heavy cream for coconut milk or cashew cream for a dairy-free version.
- Add cooked sausage, bacon, or shredded chicken for extra protein and heartiness.
- Use aged cheddar, gouda, or pepper jack on the grilled cheese for different flavor twists.
- Mix in some sautéed vegetables like spinach, zucchini, or bell peppers for more texture.
Creamy Tomato Basil Soup with Grilled Cheese Croutons
Ingredients You’ll Need:
For the Soup:
- 2 tablespoons olive oil
- 1 medium onion, finely chopped
- 4 cloves garlic, minced
- 2 cans (28 oz each) whole peeled tomatoes
- 2 cups vegetable or chicken broth
- 1 cup heavy cream
- 1 teaspoon sugar (optional, to balance acidity)
- Salt and freshly ground black pepper, to taste
- 1/4 cup fresh basil leaves, chopped
- 1 teaspoon dried oregano (optional)
For the Grilled Cheese Croutons:
- 4 slices rustic or sourdough bread
- 4 slices cheese (sharp cheddar, mozzarella, or a blend)
- 2 tablespoons butter, softened
Garnish:
- Fresh basil leaves (whole or chiffonade)
- A swirl of cream or crème fraîche
- Freshly ground black pepper
Time Needed:
This recipe takes about 10 minutes to prep, 30 minutes to simmer the soup, plus about 10 minutes to make the grilled cheese croutons. All told, plan for about 50 minutes from start to finish.
Step-by-Step Instructions:
1. Prepare the Soup Base:
Heat the olive oil in a large pot over medium heat. Add the chopped onion and cook until soft and translucent, about 5-7 minutes. Then add the minced garlic and cook for 1-2 more minutes until fragrant.
2. Add Tomatoes and Simmer:
Pour the canned whole peeled tomatoes with their juices into the pot. Using a wooden spoon, gently crush the tomatoes. Add the broth, sugar and oregano if you’re using them, plus salt and pepper. Bring the soup to a boil, then lower the heat and let it simmer uncovered for 25-30 minutes, stirring now and then.
3. Blend the Soup:
Use an immersion blender right in the pot to blend until smooth, or carefully transfer the soup in batches to a regular blender and puree until silky. Return the soup to the pot afterward.
4. Add Cream and Basil:
Stir in the heavy cream and the chopped fresh basil. Warm everything through on low heat, but don’t let it boil. Taste and adjust the salt and pepper.
5. Make the Grilled Cheese Croutons:
Butter one side of each bread slice. Heat a skillet over medium heat and place two bread slices butter-side down. Add the cheese slices on top, then cover with the other bread slices, butter-side up. Cook 3-4 minutes per side until the bread is golden and cheese is melted. Remove and let cool for a few minutes.
6. Cut into Croutons:
Once the grilled cheese sandwiches are cool enough to handle, cut each into small cubes or bite-sized pieces to make croutons.
7. Assemble and Serve:
Ladle the creamy tomato basil soup into bowls. Add a swirl of cream or crème fraîche on top. Toss in some grilled cheese croutons, sprinkle with fresh basil, and finish with freshly ground black pepper.
8. Enjoy!
Serve the soup warm with crispy and cheesy croutons on top. It’s simple, comforting, and delicious!
Can I Use Fresh Tomatoes Instead of Canned?
Yes, you can use fresh ripe tomatoes! Blanch and peel them first, then chop and cook as directed. Keep in mind fresh tomatoes might make the soup a bit lighter in flavor compared to canned.
How Do I Store Leftover Soup and Croutons?
Store leftover soup in an airtight container in the fridge for up to 3 days. Reheat gently on the stove. Keep grilled cheese croutons separate at room temperature and add them to the soup just before serving to keep them crispy.
Can I Make This Soup Dairy-Free?
Absolutely! Substitute heavy cream with coconut milk, cashew cream, or any plant-based cream alternative. The soup will still be creamy but with a slightly different flavor.
What Bread Works Best for the Grilled Cheese Croutons?
Rustic or sourdough bread works best because it holds up well when grilled and adds nice texture. Avoid very soft bread that may get soggy quickly.