Set oven to 350 F., and prepare your bundt pan. (Either grease & flour or use a baking spray that contains flour). *See notes on pan size
Sprinkle the bottom of the prepared bundt or tube pan with chopped pecans
Sift the cake mix into your mixing bowl. Add instant vanilla pudding mix, eggs, brown sugar, flour, canned sweet potato puree, milk, vegetable oil, spices, and vanilla extract.
Mix on low speed for about 10-15 seconds to incorporate before increasing to medium speed for two minutes. Stop and scrape down the sides of the bowl as needed.
Pour or scoop the cake batter into the bundt pan (on top of the pecans.)
Bake for 40-45 minutes. Times will vary based on the size of your pan, and so peek in as end time approaches and adjust as needed. When the tops spring back when lightly touched or an inserted toothpick comes out clean or with just a few crumbs attached, they are ready.
Allow the cake to cool in the pan on a cooling rack for 10 minutes. Then, turn out. *This cake domes a lot! We trimmed ours down a bit with a thin serrated knife before turning it out so that it would sit more evenly. (Everybody loves bonus cake scraps!)
Once cooled, store the cake at room temperature in a cake dome or airtight container.