Heat the oven to 325℉
In a stand mixer, combine the softened butter and sugar, and beat until light and fluffy.
Add the vanilla and egg and blend well.
Add the flour, cocoa, orange peel, and baking powder, mix well.
Shape the dough into 1-inch balls and roll in the 3 Tbsp of sugar.
Place on un-greased cookie sheets 2 inches apart.
With your thumb, make an indentation in the center of each cookie.
Fill the indentation with jam of choice; don't overfill.
Bake at 325℉ for 14-17 minutes or until firm to the touch.
Immediately remove the cookies from the cookie sheet to a cooling rack.
Cool completely.