Instant Pot Minestrone Soup

Ingredients

For 6 servings, as the recipe is written

• 1 tablespoon olive oil (or vegetable oil)
• 1 onion (finely diced)
• 3 large carrots (chopped)
• 2 ribs celery (sliced)
• 6 cups reduced sodium chicken broth
• 28 ounces canned diced tomatoes (with juice, 1 can)
• 15.5 ounces canned red kidney beans (drained and rinsed, 1 can)
• 15.5 ounces canned cannellini beans (drained and rinsed, 1 can)
• 1 ½ cups small shells (uncooked)
• ½ medium zucchini (sliced into ½-inch half moons)
• 2 cloves garlic (minced)
• 1 ½ teaspoons salt
• 1 ½ teaspoons Italian seasoning
• 2 bay leaves
• ⅛ teaspoon black pepper
• 2 cups fresh spinach (chopped)
• fresh basil (or parsley, for serving, optional)
• grated Parmesan cheese (for serving, optional)