Cozy Basil-Kissed Slow Cooker Tomato Soup

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Imagine coming home to the soothing aroma of basil and tomatoes simmering away in your kitchen. This comforting, slow cooker tomato soup is a perfect way to embrace a cool evening or simply treat yourself to a quick, wholesome meal. With a subtle hint of creaminess and layers of savory flavor, it’s sure to become a new favorite in your soup rotation.

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Ingredients

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  • 1 tablespoon olive oil
  • 1 medium yellow onion, diced
  • 2 cloves garlic, minced
  • 1 can (28 oz) crushed tomatoes
  • 2 cups vegetable or chicken broth
  • 1 teaspoon dried oregano
  • 1 tablespoon fresh basil, chopped (plus extra for garnish)
  • 1 teaspoon sugar (optional, to balance acidity)
  • Salt and freshly ground black pepper, to taste
  • ¼ cup heavy cream or half-and-half (optional for extra creaminess)

Instructions

Begin by warming the olive oil in a skillet over medium heat. Add the diced onion and sauté until it turns translucent, about 5 minutes. Stir in the garlic and continue cooking for another minute, taking care not to let it brown.

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Transfer the onions and garlic to your slow cooker. Add the crushed tomatoes, broth, dried oregano, chopped basil, and sugar if desired. Season with salt and black pepper. Stir well to combine all the flavors.

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Cover the slow cooker and set it on low for 5–6 hours or high for 3–4 hours, allowing the soup to gently simmer and develop rich flavors. If you prefer a smoother consistency, blend the soup (carefully!) using an immersion blender directly in the slow cooker or transfer to a regular blender in batches.

If you want a creamier finish, stir in the heavy cream or half-and-half during the last 15 minutes of cooking. Taste and adjust seasonings, adding more basil, salt, or pepper as needed. Serve hot with a sprinkle of fresh basil on top.

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Whether you’re looking for a warming lunch on a chilly day or a simple dinner solution for a busy weeknight, this slow cooker tomato soup is a fantastic go-to. It’s easily adaptable—go dairy-free by skipping the cream, or kick up the heat with chili flakes. The smooth, comforting flavors appeal to kids and adults alike, making it a must-try favorite in your household. Pair with a crisp green salad or a gooey grilled cheese, and you’ll have a soul-satisfying meal that fits a variety of diets and preferences.

Nathaniel Lee is an avid cook, drawing on his decades of home cooking and fine dining experience. He is a contributing chef at Mashed, and his recipes and contributions have been featured in Tasting Table, Edible Arrangements, Insanely Good Recipes, and The Daily Meal.