Crush enough soda crackers for a pie crust.
Slice onions and seperate into rings to make 3 cups.
Cook onion rings in butter until tender - not browned.
Beat 2 eggs.
Put onions in pie crust and pour in eggs.
Salt and pepper.
Sprinkle 1/3 lb. sharp cheddar cheese over and bake 20 to 30 min. at 350 deg.