Mix butter, brown sugar, shortening, peanut butter, vanilla, and eggs together
Mix in flour, baking powder, and salt
Shape into 1 inch balls
Roll balls in sugar
Put on ungreased cookie sheet
Bake 9-12 minutes at 375°F until light golden brown
Immediately top each cookie with 1 milk chocolate candy kiss
Press firmly so cookies crack around edge, let cool. MAKES 8 DOZEN.