Preheat oven to 325 degrees.

Sift flour, salt and xanthan gum into a mixing bowl and set aside.

Using a hand mixer or stand mixer, mix butter and vanilla bean paste on high speed until fluffy and lighted in color, 2 to 5 minutes.

Gradually mix in powdered sugar a bit at a time. Mix until well combined, light and fluffy.

Add flour, salt and xanthan gum mixture and mix until combined. This will pull together with a sugar cookie dough type texture.

Butter an 8x8 or 9x9 square pan or alternatively line with parchment paper.

Pat dough into pan until it is a uniform thickness.

Refrigerate for 30 minutes before baking.

Before baking, cut into 8 rectangle or 16 square biscuits.

Bake at 325 for 30-37 minutes, until lightly browned on top. Allow to cool before serving.