This Low Calorie Tomato Red Pepper Soup in a Slow Cooker is vegan, healthy, and just 38 calories per cup!
I make this red bell pepper tomato soup from fresh tomatoes, and fresh bell peppers. Making this vegan tomato soup extra healthy and delicious.


At just 38 calories per cup, this slow cooker tomato soup makes a healthy snack, side dish, or perfect “dip” for grilled cheese sandwiches.
Low Calorie Tomato Red Pepper Soup in a Slow Cooker
What You’ll Find in this Article:
Ingredients in Healthy Tomato Red Pepper Soup
It’s easy to make any recipe for tomato soup low calorie! With these helpful tips and tricks you can make all your favorite soups healthier too!
Low Calorie Tips for Making Tomato Soup Recipes:
- Olive Oil spray… save 100’s of calories and lot’s of fat by using olive oil spray! Instead of a heavy drizzle or excess butter, use a light spray of olive oil and save calories, fat, and money!
- Vegetable broth… add flavor with vegetable broth. It’s lower in calories than chicken broth, and makes this tomato red pepper soup vegan too!


Shopping List for Healthy Bell Pepper Tomato Soup:
- Olive oil spray
- Roma tomatoes
- Red bell peppers
- Yellow onion
- Garlic cloves
- Salt and pepper
- Tomato paste
- Reduced-sodium vegetable broth
- Fresh basil
How to Make Tomato Red Pepper Soup in a Slow Cooker
It’s easy to make this red bell pepper tomato soup vegan and healthy. But to build complexity, you’ll want to roast the veggies first.
This brings out the flavors and makes this tomato bell pepper soup recipe amazing!
How to Make Crockpot Tomato Soup with Red Bell Peppers:
- Preheat oven to 350 degrees and spray a rimmed baking sheet with olive oil.
- Place all vegetables and garlic on the prepared baking sheet. Spray with olive oil, and sprinkle with salt and pepper.
- Roast in the oven until lightly charred, about 45 minutes.
- Move the vegetables to the slow cooker. Add in the tomato paste, and vegetable broth. Mix well.
- Cook on LOW for 6 hours or HIGH for 3 hours.
- Add the basil, and then use an immersion blender to blend until smooth. NOTE: Alternatively, you can let the soup cool, then move to a countertop blender (vent to avoid pressure building) and blend well. Then add back to the slow cooker to reheat.
- Serve hot. Or move to lunch soup containers and reheat at work tomorrow.
Low Calorie Tomato Red Pepper Soup Recipe
This tomato bell pepper soup crock pot recipe is just 38 calories per cup!
The slow cooker tomato soup with bell peppers is great as a snack, side dish, or alongside a low calorie grilled cheese sandwich or salad for lunch.
More Low Calorie Slow Cooker Soups:


Low Calorie Tomato Red Pepper Soup
Equipment
- slow cooker
Ingredients
- Olive oil spray
- 6 Roma tomatoes halved with seeds removed
- 2 red bell peppers halved and seeds removed
- 1 yellow onion quartered
- 3 garlic cloves
- 1/2 teaspoon salt
- 1/4 teaspoon pepper
- 1/2 cup tomato paste
- 2 cups reduced-sodium vegetable broth
- 1 tablespoon fresh basil
Instructions
- Preheat oven to 350 degrees and spray a rimmed baking sheet with olive oil.
- Place all vegetables and garlic on the prepared baking sheet. Spray with olive oil, and sprinkle with salt and pepper.
- Roast in the oven until lightly charred, about 45 minutes.
- Move the vegetables to the slow cooker. Add in the tomato paste, and vegetable broth. Mix well.
- Cook on LOW for 6 hours or HIGH for 3 hours.
- Add the basil, and then use an immersion blender to blend until smooth. NOTE: Alternatively, you can let the soup cool, then move to a countertop blender (vent to avoid pressure building) and blend well. Then add back to the slow cooker to reheat.
- Serve hot. Or move to lunch soup containers and reheat at work tomorrow.
Nutrition
Nutrition and Calories in Tomato Bell Pepper Soup
Low Sodium Tip: Replace the salt with fresh lemon juice.


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Article History:
- Originally written and published October 15, 2021 by Audrey Johns
- Updated on September 11, 2023 by Audrey Johns