• 1 tablespoon olive oil
• 1 small onion, diced
• 3 cloves garlic, minced
• 4 cups chicken or vegetable broth
• 1 (14-ounce) can diced tomatoes, with juice
• 1 teaspoon Italian seasoning
• 1/2 teaspoon crushed red pepper flakes (optional, for a bit of heat)
• 8 ounces cheese tortellini (fresh or frozen)
• 3 cups fresh baby spinach, roughly chopped
• 1 cup heavy cream (or half-and-half for a lighter version)
• 1/2 cup grated Parmesan cheese
• Salt and black pepper, to taste

Optional Garnishes:

• Fresh basil leaves
• Extra grated Parmesan cheese
• Crusty bread for serving