Chocolate Mint Cookies

I made these over they weekend: delish and very rich... so, I modified this recipe a bit and also made them bite-size. They're pretty fun to make:

Ingredients-

For Cookie:

2 C. all purpose flour
3/4 C. unsweetened cocoa
1/2 t. salt
1/2 t. baking soda
1/2 C. butter, room temperature
1 C. granulated sugar
1 egg
1/2 C. milk
1 t. vanilla extract

Middle layer:
1 C. Guittard green mint chips, melted (I found these at Harmons.)

Frosting:
1/2 C. butter, at room temperature
1/2 C. unsweetened cocoa powder
4 1/2 C. confectioners’ sugar
1 t. vanilla extract
Milk
(Note: I halved this, and still had enough frosting for all cookies.)

Directions:
1. In a medium bowl, whisk together the flour, cocoa, baking soda and salt. Set aside.
2. Using a mixer, cream the butter and sugar and mix until fluffy, about 2 minutes. Add egg, milk and vanilla. Slowly add the flour mixture until well combined.
3. Using a tablespoon, scoop the dough onto a baking sheet lined with parchment paper. Bake at 350 degrees for 9-11 minutes or until firm. Let cool.
4. Spread a layer of the melted mint chips over the cookies. Put them into the fridge to let them set for about 10 minutes. Meanwhile, make the frosting.
5. Using a mixer, cream the butter. Whisk together the confectioners’ sugar and cocoa until well combined. Slowly add to the butter. Add the vanilla and a dash of milk at a time until the consistency is thick enough to spread on the cookies. Beat until smooth. Spread the frosting over the mint layer.