Prep the sweet potatoes first. After baking, allow them to cool. Remove from skin and mash out a cup for the recipe.
Preheat the oven to 350℉.
In a bowl, mix together the sweet potato and eggs. Then, add in the sour cream. Lastly, mix in the yellow box cake and stir until everything is combined.
In the baking pan, pour in half the batter. Then sprinkle the mix of the spices, pecan and brown sugar. Pour the remaining batter on top. Now, swirl everything together a little, don't mix, just a swirl.
Place in the oven and bake for 30-35 minutes or until fully cooked in the center.
When finished, remove from the oven and allow to cool.
While cooling, mix and pour the icing on top of the cake and spread it evenly. Once the cake is cool, you're ready to serve and enjoy.