Cook and drain the ravioli according to package directions.
While the pasta is cooking, shred or cube the chicken and shred the cheese.
Drain the ravioli and place it in a 7x12-inch casserole dish. Cover the ravioli with chicken, pour over the Buffalo sauce, and evenly spread the cheese over the top. (You don't have to use the whole bottle of sauce if you don't want it that saucy. Also, to cut the heat you can mix the Buffalo sauce with sour cream or cream of chicken soup. Or, you can dollop sour cream on when you serve it.)
Cook in a 350℉ for about 15 minutes until the casserole is hot and the cheese on top is melted and bubbly.
You may want to let it cool 5 minutes before serving.