YUMMY PEROGIE CASSEROLE

This recipe will all depend on how many people you want to feed , so adjust accordingly

3 lbs potatoes peeled cubed, cooked fork tender
butter 1 stick (more if you like it buttery) you can also use like whirl liquid butter
1 16 oz. package shredded cheddar cheese
1 large onion sautéed in butter
1 lb elbow mac cooked andante ( don't cook all the way )
salt and pepper
MIX all together and bake at 325 for 20 minutes let cheese crust

this is a simply casserole great for picnics