Work cream cheese, butter and flour as for pie crust. Moisten with cream. Knead lightly until smooth. Wrap in waxed paper and place in refrigerator overnight. Sprinkle flour and sugar on board. Roll out dough, cut in squares. Place teaspoon of lekvar or any desired filling in one corner and fold over and press corners slightly. Bake in moderate oven until light brown. When cool, dust with powdered sugar. Keep in uncovered container for crispness.