1 box butter flavor cake mix
1 cup vegetable oil
1 small box instant chocolate pudding
1 tablespoon pure vanilla
4 eggs
¼ cup water
1 8-ounce carton sour cream
1 6-ounce bag semi-sweet chocolate chips, or more to taste

Preheat oven to 325 F. Grease and lightly flour a Bundt pan. Mix cake mix, oil, pudding, vanilla, eggs, and water until smooth and well blended. Stir in sour cream and chocolate chips. Bake approximately 1 hour or until done. Cool on rack 10–15 minutes before removing from pan. Dust with powdered sugar before serving if desired.