Mix together the sugar, oil, hot water, eggs, and baking soda.
Add in the flour, cinnamon, baking powder, nutmeg, and salt.
Fold in the carrots and walnuts.
Using a 6-cup bundt pan coat with cooking oil spray of choice if needed and evenly spread in the batter.
Place the bundt pan on the wire trivet in the lowest position and sit inside the pot of the Ninja Foodi.
Turn the Ninja Foodi Multi-Cooker to BAKE and then Bake at 325*F for 40 minutes or until when poked with a toothpick in the deepest part it comes out clean.
Carefully remove from the foodi and place on a wire rack to cool.
While the cake is cooking whisk together the butter, cream cheese, vanilla and powdered sugar to make the frosting. If it's too runny, add additional powdered sugar in small increments or place the frosting in the fridge to harden.
Once the cake is fully cooled, carefully release it by using a spatula and releasing the sides, flip it onto the plate you will be using to serve it on.
Once it's ready, frost with the frosting and garnish with additional walnuts.
This is a dense cake, be very careful when flipping it out of the bundt pan and be sure to place it on the plate you will be serving it from.