Hershey's Mint Truffle Cookies

1 1/4 cups butter
2 1/4 cups sugar
2 eggs
2 tsp vanilla
2 1/2 cups flour
3/4 cup cocoa powder
1 tsp baking soda
1/2 tsp salt
24-36 Hershey's mint truffle kisses

In a large bowl with an electric mixer, cream butter and sugar until light and fluffy. Add eggs and vanilla and mix until well combined.
In a medium bowl, sift together flour, cocoa, baking soda and salt.  Gradually add the dry ingredients to the butter mixture and mix until combined.  Cover and refrigerate dough for one hour.
Preheat oven to 350 degrees.  Line a baking sheet with parchment paper.  Scoop tablespoons of dough into balls and roll in sugar.  Place balls on prepared cookie sheet and bake for 8-10 minutes.  Allow the cookies to cool for about 5 minutes before topping with a truffle.

Served at 2015 Relief Society Christmas party