Beat together butter and shortening on medium speed for 1 minute. Add 1 cup of the flour, egg, sugar, milk, banilla, baking powder, and salt. Beat until well mixed. Add the rest of the flour and beat well. Cover dough and chill for a few hours.
Lightly flour counter top and roll out the dough so it is about 1/8 of an inch thick. Use a heart shaped cookie cutter to make cookies.
Place cookies on an ungreased cookie sheet and bake at 375F degrees for 6-8 minutes.
Let cookies cool on racks. Then spread jam on top of half the cookies, and top with another cookie so you have a little "cookie sandwich." Spread sprinkles or red colored sugar on top.