1) Cook the fettuccine pasta according to the package directions; drain and keep warm.
2) Meanwhile, in a large skillet, melt the butter over medium heat. Add the garlic and onion; cook for 3 to 5 minutes, or until it is softened, stirring constantly.
3) Stir in bisque, heavy cream, parmesan cheese and chicken. Reduce heat to low and cook for 5 minutes, or until the chicken is heated throughly, stirring frequently.
4) Add the fettuccine and mix well.