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 for about 1-2 minutes.
Whisk in heavy cream. Cook, whisking constantly until incorporated, about 1-2 minutes.
Stir in Parmesan until slightly thickened, about 1-2 minutes. If the sauce is too thick, add more heavy cream.; season with salt and pepper, to taste.
Stir in pasta and gently toss to combine.
Warm Chicken as directed on package
Serve immediately with chicken, garnish with tomatoes if desired.