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.

Brown onion in butter in a large skillet.,Add ground beef; brown.,Spoon off fat, add salt and pepper.,Stir in 1 can cream of mushroom soup.,May cook in same skillet, or pour in casserole dish.,______,Bake 20 to 25 minutes or until bubbly.
Top with layer of Tater Tots.