I found this recipe in a Gooseberry Patch Cookbook. I served them with a little sour cream and chopped green onions! (Little Potato Recipes)
the best recipes of all time: Texas Peanut Butter Sheet Cake (Recipe is past the ad farther down on the page.
My Mom's squash casserole has buttered bread crumbs on top instead of the Ritz crackers, but otherwise this recipe sounds a lot like hers!