Pre-heat oven to 350℉. Line 3 cookie sheets with parchment paper.
In the bowl of a stand mixer, cream together the butter and sugar until smooth. Beat in the chocolate extract. Then mix in the flour and baking cocoa until the dough just comes together.
Roll the dough into 1 - 1 ½ inch balls and place on prepared cookie sheets. Make a small depression in the center of each ball using your thumb. Fill each hole with ¼ teaspoon preserves.
Bake for 14-16 minutes or until lightly browned. Remove from oven and let cool for 1 minute before moving the cookies to a cooling rack.