Small Cake From Half Cake Mix

Preheat oven to 350 degrees F (175 degrees C). Grease and flour an 8- or 9-inch round cake pan.

In a large bowl, combine the cake mix, water, oil, and egg. Beat with an electric mixer on medium speed for 2 minutes.

Pour batter into the prepared pan and bake for 25 to 30 minutes, or until a wooden skewer inserted into the center comes out clean.

Let cool in the pan for 10 minutes before inverting onto a wire rack to cool completely.

Dust with confectioners' sugar before serving.