Given the task definition and input, reply with output. In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Mix soup and mayonnaise together in a large bowl.,Blend in chicken, celery, onion and water chestnuts.,Spoon mixture into a lightly greased baking dish (13 x 9-inch).,Mix stuffing with melted butter and sprinkle mixture on top of the chicken.,______
Cover with foil and bake at 350 for 30 to 40 minutes until bubbly and browned on top.