Mix butter, cream cheese and flour. Make 24 balls - shape into small muffin tins. Mix egg, brown sugar, pecans and butter together. Put 1 tsp. into each muffin tin. Bake at 350-degrees for 11-15 minutes. Lower temperature to 250-degrees. Bake 10 minutes more. Let cool 5 minutes before removing. Let cool and sprinkle with powdered sugar.