Mix chocolate cake mix, eggs, pumpkin puree, sugar, oil, water, cinnamon, and nutmeg together in a bowl. Beat well.
Pour the batter into the prepared bundt cake pan.
Bake in the preheated oven for about 35-40 minutes or until a toothpick inserted in the center comes out clean.
Cool the cake for 10 minutes in the pan, then turn it out onto a cake plate to cool completely.
Once the cake is cool, dust it with powdered sugar.
Store the cake covered at room temperature.
The calories shown are based on the cake being cut into 12 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**