Creamy Cajun Chicken

Name: Creamy Cajun Chicken
Ingredients: 1 pound boneless and skinless chicken breasts (or thighs), pounded thin; 2 teaspoons cajun seasoning (link); 2 tablespoons all-purpose (optional) (gluten-free for gluten-free); 2 tablespoons oil; 2 tablespoons butter; 1/2 cup onion, diced; 1/2 cup celery, diced; 1/2 cup bell pepper, diced; 4 cloves garlic, chopped; 2 tablespoons all-purpose flour (gluten-free for gluten-free); 1 cup chicken broth (link); 1 cup heavy/whipping cream; 1/2 cup parmigiano reggiano (parmesan cheese), grated; salt and pepper to taste; 1 tablespoon parsley, chopped (optional); 2 green onions, thinly sliced (optional)