Preheat oven to 350°F. Mix shortening and peanut butter, add 1/2 cup granulated sugar, brown sugar, baking soda, baking powder. Beat until combined. Then beat egg, milk, and vanilla. Then beat in as much flour as you can with a mixer, then you can stir in the rest.
Shape dough into 1 inch balls. Roll balls in 1/4 cup granulated sugar. Place 2 inches apart on an ungreased cookie sheet.
Bake for 10-12 minutes. Immediately press a chocolate kiss into center of cookies. Let cool.