Mix chocolate cake mix, buttermilk, melted butter and eggs on medium speed for 2 minutes.
Stir in chocolate chips.
Line a jelly roll pan with a silicone mat or parchment paper.
Pour cake batter into pan and bake at 350 degrees for 11-14 minutes.
Cool for 10 minutes in the pan. Then, turn onto a wire rack and peel off silicone mat or parchment paper.
Allow the cake to cool completely before cutting into twenty 2 1/2 inch circles using a biscuit cutter.