Creamy Tomato Tortellini Soup

Name: Creamy Tomato Tortellini Soup
Prep time: 15 min
Total time: 15 min
Cuisine: European, Italian, Mediterranean
Ingredients: 1 tbsp. butter; 1/2 medium onion, diced; 4 cloves garlic, minced; 3 tsp. Italian seasoning; 1/2 tsp. red pepper flakes; 3 tbsp. all-purpose flour; 3 tbsp. tomato paste; 3 c. low-sodium chicken or vegetable broth; 1 (28-oz.) can diced tomatoes; 4 c. cheese tortellini; 1/3 c. heavy cream; 1/2 c. freshly grated Parmesan; 3 c. spinach, packed; Kosher salt; Freshly ground black pepper; 2 tbsp. thinly sliced basil, for garnish