Preheat oven to 350°F (175°C) and grease a bundt pan.
In a large bowl, mix the cake mix, pudding mix, eggs, sour cream, vegetable oil, milk, and vanilla extract.
Beat with a hand mixer for 2 minutes until smooth.
Fold in chocolate chips gently.
Pour the batter into the prepared pan and smooth the top.
Bake for 50-60 minutes or until a toothpick inserted in the center comes out clean.
Allow the cake to cool in the pan for 10-15 minutes before transferring to a wire rack.
Serve warm, dusted with powdered sugar, or with a drizzle of chocolate ganache.