Combine flour, coconut sugar, baking powder, baking soda, kosher salt and xanthum gum in a medium mixing bowl.
Slice or cube the butter and add to bowl. Cut in the butter with a fork or pastry blender until coarse and pebbly.
In small bowl combine beaten egg and unsweetened almond milk. Pour into dry ingredients and mix until just moist. Spread into a well-greased 8x8 square baking dish; build up edges a bit. Sprinkle the top with cane sugar.
Bake for 15 minutes (middle rack).
Remove and set on cooling rack and let cool slightly.