Cook fettuccine according to package directions adding broccoli last 3 minutes, drain. Set aside.
Meanwhile, melt butter in medium saucepan over medium heat. Add minced garlic with the butter. Add cream, garlic powder, and pepper.
Simmer, uncovered, for 10 to 12 minutes or until thick, stirring frequently. Trust me, it will thicken. When sauce has reached desired consistency, stir in Parmesan cheese.
Add cooked chicken to Alfredo sauce and heat through. Serve over hot, cooked fettuccine and broccoli.