In a bowl, combine flour, baking powder and salt; set aside. Combine sour cream and egg; mix well. Stir into dry ingredients just until moistened. Turn onto a lightly floured surface; knead gently 4 to 5 times. Roll to 1/2-in. thickness; cut with a 2-1/2-in. biscuit cutter. Place on a greased baking sheet. Bake at 425° for 10-12 minutes or until lightly browned.
Meanwhile, in a blender or food processor, process ham until finely minced. Add butter and continue processing until well mixed. Spread over warm biscuits.