Ingredients

• 1 tablespoon olive oil
• 4 stalks celery , chopped
• 1 cup chopped carrot
• 1 small yellow onion , chopped
• 2 cloves garlic , chopped
• 4 cups vegetable broth
• 1 , 14.5 ounce
• 1 , 14.5 ounce
• 3 tablespoons tomato paste
• 2 teaspoons dried basil
• salt and ground black pepper to taste
• 0.25 cups butter
• 0.25 cups all-purpose flour
• 1 cup milk
• 0.5 cups grated Parmesan cheese
• 1 tablespoon raw cane sugar , Optional
• 1 teaspoon red pepper flakes , Optional

Instructions

1. 1 Turn on a multi-functional pressure cooker (such as Instant Pot) and select Sauté function. Add olive oil, celery, carrot, onion, and garlic. Cook for 5 minutes, stirring occasionally.
2. 2 Stir in vegetable broth, diced and crushed tomatoes, tomato paste, basil, salt, and pepper. Close and lock the lid. Select high pressure according to manufacturer's instructions; set timer for 6 minutes. Allow 10 to 15 minutes for pressure to build.
3. 3 Meanwhile, melt butter in a small saucepan over low heat. Stir in flour until a smooth, thick paste forms, about 3 minutes.
4. 4 Release pressure naturally for 2 minutes according to manufacturer's instructions. Release remaining pressure by opening the valve to vent.
5. 5 Use an immersion blender to carefully puree the hot soup. Select Sauté function again; set timer for 3 minutes. Add flour paste, stirring continuously. Add milk, Parmesan cheese, sugar, and red pepper flakes. Season with more salt and pepper if needed. Stir to combine until the timer ends.

Nutrition per serving