1 1/2 lbs. frozen hash brown potatoes
1 c. milk
1/2 lb. butter (2 sticks)
1/2 lb. Velveeta cheese
4 oz. sharp cheddar cheese, grated

Arrange potatoes in 9 x 9 inch dish. Melt remaining ingredients together. Pour over potatoes. Stir and mix gently. Cover and refrigerate one hour or longer. Bake, uncovered, for one hour at 350 degrees. May be frozen after baking.