Kosher salt and freshly ground black pepper, to taste
2 Roma tomatoes, diced
2 tablespoons chopped fresh parsley leaves
In a gallon size Ziploc bag, add chicken, 1 tablespoon olive oil and cajun seasoning, shaking to coat thoroughly.
Heat remaining 1 tablespoon olive oil in a grill pan over medium high heat. Add chicken and cook, flipping once, until cooked through, about 5-6 minutes on each side. Set aside and keep warm.
In a large pot of boiling salted water, cook pasta according to package instructions; drain well.
Melt butter in a saucepan over medium heat. Add garlic, and cook, stirring frequently, until fragrant, about 1-2 minutes.
Gradually whisk in heavy cream and lemon zest. Cook, whisking constantly, until incorporated, about 1-2 minutes. Stir in Parmesan until slightly thickened, about 1-2 minutes. If the mixture is too thick, add more heavy cream as needed; season with salt and pepper, to taste.
Stir in pasta and gently toss to combine.
Serve immediately with chicken, garnished with tomatoes and parsley, if desired.