Blend pumpkin puree, coconut milk, and banana together in a large bowl.
Mix sugar, xanthan gum, cinnamon, salt, ginger, nutmeg, and cloves together in a small bowl; add to pumpkin mixture and blend. Pour the pumpkin mixture into a casserole dish.
Bake in preheated oven for 15 minutes. Reduce heat to 350 degrees F (175 degrees C) and continue baking until a toothpick inserted into the center comes out clean, 30 to 45 minutes more.
