Italian Orzo Spinach Soup

Name: Italian Orzo Spinach Soup
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Italian
Ingredients: 1 tablespoon olive oil; 1 small white onion (peeled and diced); 1 cup diced carrots; 1 cup diced celery; 6 cloves garlic (pressed or minced); 1/2 teaspoon crushed red pepper flakes; 6 to 8 cups chicken or vegetable stock; 1 (14-ounce) can fire-roasted diced tomatoes; 1 1/2 tablespoons Italian seasoning; 1 cup (about 8 ounces) uncooked orzo pasta; 2 large handfuls fresh baby spinach or kale; fine sea salt and freshly-cracked black pepper; optional toppings: freshly-grated Parmesan cheese and/or chopped fresh basil