Preheat the oven to 350 degrees.
Place parchment paper onto a cookie sheet and set aside.
Using a standing mixer, cream together the butter, sugar, brown sugar, and shortening and mix until combined.
Add in the egg and peanut butter and mix until combined.
In a large bowl, using a whisk mix in the flour, baking powder, baking soda and salt.
Gradually add in the flour mixture into the wet mixture until combined.
Using a ice cream scoop, scoop some cookie dough into your hands and roll into a ball.
Roll cookie dough ball into the sugar and then place onto the cookie sheet.
Repeat the steps for 11 more cookie dough balls.
Bake in the oven for 5 minutes.
Pull the cookies out and place each marshmallow onto the cookie.
Bake for another 5 minutes or until the marshmallow is lightly toaster.
Pull cookies out and place unwrapped Hershey kiss into the center.
Let cool completely before enjoying!.