Blueberry "Buttermilk" Cake

This cake recipe is adapted and slightly modified from Cooking Light.3 cups All Purpose Flour Blend (I used rice)½ cup sorghum flour1 ½ tsp. xanthan gum1 ½ tsp. baking powder1 tsp. cinnamon½ tsp. nutmeg½ tsp. baking soda¼ tsp. salt1 ½ cups sugar½ cup palm shortening2 tbsp. ground flax seedScant 1 ½ cups rice milk plus 1 tbsp. lemon juice2 beaten eggs½ cup apple or pear butter1 tsp. vanilla2 cups