I got this recipe out of the JLSB's Mardi Gras to Mistletoe cookbook. I have seen many variations to it, but this is a good one. I made this for Leslie's birthday.
1 (2-layer) package yellow butter cake mix
1 (6 oz) package chocolate instant pudding mix
1/2 cup vegetable oil
1/2 cup water
1 cup sour cream
1 cup (6 oz) semisweet chocolate chips
Combine the cake mix, pudding mix, oil, water, eggs, and sour cream in a mixing bowl and beat for 2 minutes, scraping bowl occasionally. Stir in the chocolate chips and spoon the batter into a greased and floured 10-inch tube pan or bundt pan. Bake at 350 degrees for 1 hour or until wooden toothpick inserted near the center comes out clean. Cool in the pan for 10 minutes and remove to a wire rack to cool completely. Dust with confectioners' sugar.