Preheat oven to 450°. In a food processor, process ham until ground; set aside. In a large bowl, combine the flour, baking powder, baking soda, onion powder, garlic powder and mustard. Cut in shortening until mixture is crumbly. Fold in ham and chives. Add buttermilk; stir just until the dough clings together. , Turn onto a lightly floured surface; knead gently 10-12 times. Roll dough to 1/2-in. thickness. Cut with a floured 2-1/2-in. biscuit cutter. Place in a large ungreased cast-iron or other ovenproof skillet. Bake until golden brown, 13-15 minutes. Brush with butter. Serve warm.