This recipe (from Mary's mom's friend Rita) starts with boxed cake mix, so it's easy to whip up in case company stops by.
Preheat the oven to 350°. Grease an 8-inch cake pan. In a large bowl, stir the cake mix, eggs, oil, pudding mix, and sour cream until smooth. Fold in the chocolate chips. Pour into the cake pan and bake until a tester inserted into the center comes out clean, 25 to 30 minutes.