Preheat oven to 350

Boil water and cook 25 jumbo shells, strain and rinse with cold water. Keep in strainer, set aside.

Cook and shred chicken. Steam broccoli bag in microwave and chop.

Mix 1 jar of alfredo sauce, chicken, broccoli, and both cheeses. Stuff mixture into shells. Line caserole dish with 1/2 jar alfredo sauce. Line stuffed shells in dish, top with remaining alfredo sauce

Cover with foil and bake for 35 minutes