– 1 pound penne pasta or bow tie – 4 boneless skinless chicken breast – 1 tablespoon cajun seasoning – 1 tablespoon olive oil – 3 tablespoons unsalted butter – 1 small yellow onion diced – 3 cloves garlic minced – 1 cup heavy cream – 1 teaspoon lemon zest – ¼ cup freshly grated Parmesan – 1/2 teaspoon kosher salt – 1/2 teaspoon black pepper – 3 Roma tomatoes diced for garnish – 2 tablespoons fresh parsley leaves chopped for garnish – 1 tablespoon green onions chopped for garnish – Shredded parmesan for garnish