1 can sweetened condensed milk (Eagle Brand is good)
1 (13 oz. or 16 oz.) container sour cream

Mix above ingredients thoroughly. Put mixture in a 9-inch glass or Corning Ware baking dish. Bake for 15 minutes at 250 degrees in an oven that has not been preheated. Cool, then chill. This is very sweet and is good served with any tart fruit such as rhubarb, berries or pineapple.