Pre-heat oven to 350 degrees. Line an 8x8 baking pan with parchment paper - leave enough paper to hang over the sides to lift the bars out of the pan.

In the bowl of a stand mixer, cream together the butter and brown sugar. Beat in the egg and 1 tsp vanilla extract.

Sift in the flour, xanthan gum, baking powder and sea salt. Mix until combined. Mix in the oats. Refrigerate while preparing the fudge layer.

To make the fudge layer, add the chocolate chips, coconut oil and coconut milk to a small sauce pan. Heat over low heat and stir frequently until the chocolate chips are melted. Remove from heat and stir in the remaining 1 tsp vanilla extract. Set aside.

Press half the oatmeal mixture into the baking pan. Pour the fudge layer of the crust and spread evenly over the crust.

Crumble the remaining oat mixture over the top of the fudge layer. Bake at 350 degrees for 25-30 minutes. Cool completely before removing from the pan and cutting.