- Preheat oven to 350 degrees. Line 2 large baking sheets with parchment paper 
- In a medium mixing bowl whisk together almond flour, vital wheat gluten. tapioca flour, salt, baking powder, and cream of tartar until fully combined. 
- In a large mixer bowl beat Softened butter and powdered Swerve on low for 1 minute of until creamy.  
- Add egg yolks and vanilla. Beat on low 1 more minute or until light and fluffy. 
- Add dry ingredients to wet ingredients and beat on low 30 seconds or until no dry ingredients are left in the bowl.  
- Scrape all ingredients to the center of the bowl. Lightly cover the bowl with plastic wrap and place in the refrigerator for at least 1 hour. 
- Remove dough from refrigerator and place dough onto lightly floured work surface 
- Press or roll dough out to 1/2-1/4 inch thick. Place onto prepared baking sheet and bake 8-10 minutes or until the edges are lightly brown. 
- Let cookies cool on the pan for 5 minutes then transfer to a wire rack to cool completely. 
- Cookies will be soft at first but they will firm up as they cool. Let cookies cool completely before frosting.