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Slow Cooker Roasted Tomato Basil Soup Recipe with Grilled Cheese Croutons

slow cooker roasted tomato basil soup - featured image

A cozy and easy slow cooker roasted tomato basil soup paired with crispy grilled cheese croutons, perfect for chilly days and casual dinners.

Ingredients

Scale
  • 4 lbs ripe Roma tomatoes, halved
  • 1 large yellow onion, roughly chopped
  • 4 cloves garlic, smashed
  • 1/4 cup olive oil, plus extra for drizzling
  • 1 cup vegetable or chicken broth
  • 1/2 cup fresh basil leaves, loosely packed
  • 1 tsp kosher salt
  • 1/2 tsp freshly ground black pepper
  • 1 tsp sugar or honey (optional)
  • 4 slices sturdy bread (sourdough or country white)
  • 4 oz sharp cheddar cheese, sliced or shredded
  • 2 tbsp butter, softened

Instructions

  1. Preheat oven to 425°F (220°C). Line a rimmed baking sheet with parchment paper or foil.
  2. Cut Roma tomatoes in half and remove core if desired. Place cut side up on baking sheet. Drizzle with 2 tablespoons olive oil and sprinkle with salt and pepper.
  3. Roast tomatoes for 30-35 minutes until soft and caramelized.
  4. While tomatoes roast, roughly chop onion and smash garlic cloves.
  5. Transfer roasted tomatoes with juices to slow cooker. Add onions, garlic, broth, remaining 2 tablespoons olive oil, salt, pepper, and sugar or honey if using.
  6. Cook on low for 4-5 hours, stirring occasionally. Alternatively, cook on high for 2-3 hours.
  7. About 15 minutes before serving, add torn basil leaves to slow cooker.
  8. Blend soup with immersion blender until desired consistency is reached.
  9. To make grilled cheese croutons: butter one side of each bread slice, place cheese between two slices with buttered sides out, and cook in skillet over medium heat for 3-4 minutes per side until golden and melty. Cut into bite-sized cubes.
  10. Serve soup hot topped with grilled cheese croutons and garnish with fresh basil leaves if desired.

Notes

Roasting tomatoes intensifies sweetness and reduces acidity. Blend soup to desired texture, not too smooth. Make grilled cheese croutons fresh before serving for best crispness. Add baking soda carefully if soup is too acidic. Use gluten-free bread and dairy-free cheese for dietary adaptations.

Nutrition

Keywords: slow cooker, roasted tomato soup, basil soup, grilled cheese croutons, comfort food, easy soup recipe, cozy meal