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.

Cook squash and onion until tender.,Mash up.,Add eggs and milk.,Stir well.,______,Mix.,Add crackers and stir.,Butter sides of baking dish.,Bake 30 minutes at 325.,Last 10 minutes, add a few crumbled crackers on top.
Add pepper, cheese, sugar, margarine, salt and pepper.