Preheat oven to 400° F.
Cook noodles according to package instructions. Drain and set aside.
In a large saucepan, melt butter over medium heat. Add flour and cook, stirring, 5-6 minutes until mixture is thickened.
Add seasonings and stir.
Slowly add milk, stirring constantly. Continue cooking and stirring until mixture is thickened and bubbly.
Add shredded cheese and cream cheese; mix until cheese is completely melted.
Stir in buffalo sauce and cooked noodles.
Transfer to a 9x13 inch casserole dish.
Add mac & cheese and chicken bites to the preheated oven; bake for 20 minutes. Prepare chicken bites according to package instructions.
Chop chicken and add to mac & cheese.
Sprinkle with chopped green onions and season with pepper.