Preheat the oven to 350 degrees. Season 12" cast iron skillet with a thin layer of oil or melted butter.

In a small bowl whisk the flour, sugar, baking powder, xanthan gum and salt until combined.

In a separate bowl whisk together the coconut milk beverage, egg, melted butter and vanilla and vinegar.

Using an electric mixture or spatula add in the flour mixture and mix until combined.

Pour the batter into the cast iron skillet and smooth it out from the center to the ends using a spatula.

In a small bowl mix up the brown sugar, cinnamon and melted butter. Stir until smooth. Spoon the topping onto the crust.

Use a butter knife, swirl the cinnamon sugar into the top layer of the crust. Leave about 1/2 inch of the edge without topping.

Bake for 35-37 minutes. While you make the glaze icing.

In a small bowl stir together the powdered sugar, coconut milk beverage and vanilla together until smooth.

Use a pastry brush to spread a thin layer of glaze over the top of the pizza immediately when it comes out of the oven. If the glaze is too thick it will be hard to spread. Add a bit of milk to thin it out. Let it cool 10 minutes and add any remaining glaze icing.

Slice, serve and enjoy it while it's warm or let it cool completely.