In a larger bowl, cream the butter and sugar until creamy and mixed. Scrape down sides if necessary.
Add the applesauce (or egg), vanilla and lemon extracts and beat until everything is combined.
With the mixer running, add in your dry ingredients. Start with the sea salt, baking powder, and guar gum first, then follow with the flours. Blend well to form a stiff dough.
Preheat oven to 350 degrees.
Divide the dough into two equal balls. Wrap one and put it in the fridge while you work with the first half. Dust your surface with any flour, and dust your 1st ball of dough.
Roll out to desired thickness, I do about 1/4 inch. If the dough seems overly soft, throw the whole cookie sheet into the freezer to firm up while you preheat the oven.
Bake in 350-degree oven for about 8 minutes until lightly golden around the edges (end time will depend on the thickness and size of your masterpieces!).
Let rest for 5 minutes before transferring to a cooling rack. When cool, frost if desired.
Repeat the process with the second ball of dough!