It's crunchy! Peggy Carter has made a squash casserole that is a favorite with her family, partly because it has crispy fried onions rings on the inside AND in the topping. In order to keep the top onion rings crunchy, Peggy has frozen her casserole without them. But not to worry, the crispy onions for the top will be given to you when you pick up the casserole. 10" X 12" casserole dish; yield: 8 - 10 servings.