Beat butter until soft and fluffy (2 minutes). Add eggs 1 at a time and mix well. Add sugar, vanilla, salt, baking powder and blend. Add flour in stages mixing well after each stage. (mixture will be very thick - use a wooden spoon at the end if necessary) Chill dough at least 1 hour. (follow my tips in the tip thread for easy rolling between sheets of waxed paper)
Roll dough ¼ inch thick and cut with cutters. (option – decorate unbaked cookies with colored decorating sugars and bake) Bake in 350F oven for 6-8 minutes until cookies are just brown on the edges. Cool completely.
or Decorate plain cookies with buttercream frosting (you may add food color to the icing if desired)