Creamy Cajun Chicken Pasta

Name: Creamy Cajun Chicken Pasta
Prep time: 5 min
Cook time: 16 min
Total time: 21 min
Cuisine: American
Ingredients: 8 ounces penne pasta (cooked according to package instructions); 2 tablespoons olive oil; 2 boneless skinless chicken breasts (pounded thin); 1 1/2 tablespoons Cajun seasoning (divided); 2 tablespoons unsalted butter; 2 cloves garlic (minced); 1 tablespoon all purpose flour; 1 1/2 cups half and half; 1/3 cup grated Parmesan (plus more for topping); salt and pepper to taste; 1 diced tomato; fresh parsley (chopped)