Creamy Tortellini Soup

Ingredients

• 1 tablespoon olive oil
• 1 medium onion, chopped
• 3 cloves garlic, minced
• 1 pound Italian sausage, casing removed
• 1 teaspoon dried oregano
• 1/2 teaspoon crushed red pepper flakes
• Salt
• pepper
• 4 cups chicken broth
• 1 (14 oz) can diced tomatoes
• 1 package (9 oz) refrigerated cheese tortellini
• 3 cups spinach, chopped
• 1 cup heavy cream
• 1/4 cup Parmesan cheese, grated
• Fresh basil, chopped, for garnish