In a bowl, combine the mayonnaise and ranch dressing.
Stir in the cooked squash, eggs, cheese, and crushed saltines until well mixed.
Melt the butter and combine it with the stuffing.
Take one cup of the squash mixture and blend it with the stuffing mixture.
Combine this with the other ingredients thoroughly.
Top the casserole with additional cheese and the remaining stuffing.
Bake in a preheated oven at 350°F for 35 to 40 minutes.
