Cook tortellini according to packaged directions.
Melt butter in a medium sauce pan, add garlic. Cook for 1 minute over medium heat
Add flour and cook for an additional minute, stirring constantly.
Add milk and broth, stirring constantly. Cook until sauce boils and thickens.
Add parmesan cheese. Add desired salt and pepper. Continue stirring until cheese has melted.
Add cooked tortellini to sauce, and gently mix until coated. Sprinkle with fresh parsley