One-Pan Chicken and Spinach Orzo

Name: One-Pan Chicken and Spinach Orzo
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Italian
Ingredients: 1 tablespoon olive oil; 1/2 white onion (diced finely); 3 cloves garlic (minced); 1 cup chicken broth ((I like Better Than Bouillon Base)); 3/4 cup uncooked orzo pasta; 1 (14.5 ounce) can diced tomatoes (undrained (if you can get the version that has basil and oregano great!)); 1 teaspoon italian seasonings; 1/2 teaspoon kosher salt ((more to taste later)); 1/4 teaspoon crushed red pepper flakes ((optional if you like heat)); 2 cups shredded rotisserie chicken ((see notes)); 3 cups spinach leaves ((measured then chopped)); 1/4 cup grated Parmesan cheese