Preheat oven to 375?F

Line 2 baking sheets with parchment paper.

In bowl sift together flour, cocoa powder, baking soda and salt.

In a mixer cream together butter, shortening and brown sugar until we'll combined

Add in egg and vanilla, beat for 2 minutes

Turn mixer to low and add half of flour/cocoa mixture, then half the milk, repeating until all the ingredients are mixed in.

Drop by rounded tablespoon, 2 inches apart onto prepared baking sheets

Bake 8-10 minutes

Cool on pan for 5 minutes and then transfer to wire rack to finish cooking b

Fill with prepared filling.