Tomato Soup Gratin
Tomato Soup Gratin combines your favorite grilled cheese sandwich and tomato soup recipes into one unctuous dish! Make ordinary boxed tomato soup extraordinary with this Tomato Soup Gratin recipe.
Upgrade your tomato soup game with this easy Tomato Soup Gratin! A rich, herby tomato soup gets a gourmet twist with crispy grilled cheese croutons and a bubbly, golden cheese topping. Comfort food at its finest!
Tomato Soup Gratin
What is a Gratin?
A gratin is a dish that has a crispy, golden-brown crust on top, typically achieved by baking it with cheese, breadcrumbs, or both. The term comes from the French word gratter (to scrape) because of the crispy, baked topping that often needs to be scraped from the dish.
In this Tomato Soup Gratin, the bubbly, golden layer of melted cheese (and the grilled cheese croutons) creates that signature gratin-style crust—just like in French onion soup, but with a tomato soup twist! 😍🧀🔥
People will love this Tomato Soup Gratin because it takes a familiar, comforting classic—tomato soup and grilled cheese—and elevates it into something extra special with minimal effort. Here’s why it’s so appealing:
- Easy & Quick – Uses boxed tomato soup as a base, saving time while still delivering amazing flavor.
- Cheesy, Crispy Goodness – Grilled cheese croutons and a golden, bubbly cheese topping make every bite indulgent.
- Cozy & Nostalgic – It’s like a grown-up version of a childhood favorite, but with a fun, fancy twist.
- Perfect for Entertaining – Feels elevated enough for a dinner party but is easy enough for a weeknight meal.
- Customizable – You can switch up the cheeses, add spices, or even throw in some crispy bacon or caramelized onions for extra depth.
It’s basically French onion soup meets classic tomato soup and grilled cheese—what’s not to love? 😍
Tips for Making Tomato Soup Gratin
First, I used a boxed tomato and red pepper soup. I used this Roasted Red Pepper and Tomato Soup from Pacific Food, and it’s wonderful.
Now, I do add the following to almost any boxed tomato soup:
- Oregano
- Thyme
- Kosher Salt
- Black Pepper
- Butter
You’ll find the measurements for the additional ingredients in the recipe card below.
What to Serve with Tomato Soup Gratin
If you’re serving this for a dinner party, this Wedge Salad for a Crowd is sensational!
My other favorite salad to serve would be Toni’s Chopped Salad. It’s an “all-purpose” salad, meaning it goes with anything!
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Tomato Soup Gratin
- Prep Time: 15
- Cook Time: 15
- Total Time: 30 minutes
- Yield: 6 1x
- Category: main dish
- Method: stove top
- Cuisine: american
Ingredients
- 1, 32-ounce box Roasted Red Pepper and Tomato Soup
- 1 tsp Oregano
- 1 tsp Thyme
- 1/2 tsp Kosher Salt
- 1/2 tsp Black Pepper
- 1 TBS Butter
- 4 grilled cheese sandwiches, cut into squares (see notes!)
- 1/2 cup Shredded Cheddar Cheese
- 1/2 cup Low-Moisture Mozzarella Cheese
- Garnish: Fresh Basil
Instructions
- Preheat your oven to 375˚.
- Heat your soup in an oven-safe pot. I like using my Le Creuset Dutch oven; I used the 2-quart sized one.
- Once your soup begins to heat up, add in one teaspoon of oregano, one teaspoon of thyme, half a teaspoon of kosher salt, and half a teaspoon of black pepper. If you’re grinding pepper, do 5-6 cranks!
- Once your soup is heated through, stir in the one tablespoon of butter. You don’t have to do this; I just think it makes it look pretty.
- Top your warm soup with the grilled cheese croutons. Some will sink a bit, but don’t worry!
- Add half a cup of shredded cheddar and half a cup of mozzarella cheese on top of the croutons.
- Bake the entire thing (be careful when you move it to the oven… you’re carrying soup!) and bake at 375˚ for about 10-15 minutes, or until the top is golden brown. Feel free to be brave and broil the top!
- Remove from the oven, top with chopped fresh basil, and serve!
Notes
Notes on the Grilled Cheese:
I made mine how I always do… Bread slices with American cheese are in the center, griddled with butter. I usually add mayo to the bread, but I did not this time.
