3⁄4 pound Penne Pasta

2 tbsp. butter

2 skinless boneless chicken breast halves, sliced 1/2" thick

3 cloves garlic, minced

1 bunch green onion, chopped

2 tbsp. Cajun seasoning

1 tsp. freshly ground black pepper

1 tsp. ground cayenne pepper

8 oz. heavy cream

1 green bell pepper, julienne

1 red bell pepper, julienne

8 oz. fresh mushrooms, quartered

3⁄4 cup Reggiano Parmesan cheese, grated