Preheat oven to 350 degrees. Oil a bundt pan with a little shortening.
In a large mixing bowl, whisk together the flours, baking powder, xanthan gum, baking soda, salt, and spices.
In another large bowl beat together with an electric mixer the shortening, pumpkin, sugar, and vanilla. Add the dry ingredients to the bowl and continue to beat. Slowly add the cup of milk as you are mixing. Continue to beat for another 60 seconds or so.
Scoop batter into prepared bundt pan and spread it evenly throughout.
Bake for 50 to 55 minutes. Let pan cool for about 10 to 15 minutes before flipping cake out onto a plate or cake platter.
After the cake is completely cool you can drizzle a glaze over the top of it made from powdered sugar and a little non-dairy