Preheat oven to 375*
In a large mixing bowl, cream together the butter, peanut butter, and both sugars til smooth.
Add in egg and vanilla and blend til combined with batter
Mix in dry ingredients gradually til smooth.
Put 1/2 cup sugar in a small bowl. Shape batter into small balls and roll in the sugar to lightly coat, then place balls on an ungreased cookie sheet to bake
Bake at 375* for about 8 minutes or til slightly browned. Remove from oven and immediately gently push Hershey Kiss into middle of each cookie.
Return to oven for an additional 1-2 minutes.
Remove from oven and cool on rack. ENJOY!