Combine butter and sugars, beat until fluffy. Add eggs, milk and vanilla; beat well. Combine flour, baking powder and salt; stir into batter. Cover and chill 3-4 hours. Roll out about 1/3 of the dough to 1/8th thickness on lightly floured board. Cut into desired shapes. Bake at 375 degrees on ungreased cookie sheet for 8-10 minutes or until done. Cool, decorate. I use the decorator frosting in the tubes, spread it out and then dip into colored sugar sprinkles.Looking for more Christmas cookie recipes? Find them all here!