These rich, tender chocolate cupcakes have a deep cocoa flavor and a soft, moist crumb. The simple batter comes together easily with a mixer, and piping it into the cupcake liners makes it easy to portion the cupcakes evenly. They are delicious plain or can be finished with your favorite frosting.

   Buttermilk ok kefir is at room temperature. If using frozen blueberries, do not thaw them before adding them to the batter to prevent the batter from turning purple.