Preheat oven to 350 degrees. Grease and flour a 12 cup bundt pan with cooking spray, or spray with cooking spray if using a non-stick pan.
Combine cake mix, pumpkin puree, eggs, water, butter, pumpkin pie spice, and vanilla extract in a large mixing bowl. Beat one to two minutes until well blended. Stir in chocolate chips. Pour into prepared pan.
Bake 35-40 minutes or until toothpick inserted in the middle comes out clean. Cool in pan for 10 minutes, then invert onto a wire rack to cool completely.
Top cake with melted chocolate.
To melt chocolate in the microwave: place chocolate in a microwave safe bowl. Microwave in 30 second intervals, stirring in between intervals.
Video
Notes
Nutritional information is an estimate.
Top cake with powdered sugar instead of melted chocolate, if desired. Use a fine mesh strainer to sift the sugar over the top.