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 mix until combined
In a large bowl, using a whisk mix in the flour, baking powder 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!