Mix the first four ingredients. Cut in butter until mixture resembles cornmeal. Add add-ins, then mix in the vanilla and milk. Mix until a soft dough forms. Add more milk if needed. Divide dough into fourths, and shape each fourth into a ball. Roll out to a 1-inch thickness. Cut into 4 pieces. Place on doubled sheet pans (due to temperature). Brush with milk and dust with sugar. Bake at 400 degrees For 15 minutes or until light golden brown.