Preheat oven to 350°. Cover a large baking sheet with parchment paper.
In a medium mixing bowl combine almond flour, brown rice flour, oat flour, baking soda, xanthan gum, Saigon cinnamon, and pinch of salt. Whisk until well combined.
 In a large mixing bowl cream butter with hand mixer on MED until smooth. 
 Add sugar to butter and use hand mixer on MED to cream until smooth. 
 Add vanilla, almond butter, and apple cider vinegar. Mix on MED/MED-HIGH until well blended and smooth. 
 Add eggs and blend on MED until well combined.
 Pour dry ingredients into the large bowl containing wet ingredients. Mix well with a wooden spoon until dough comes together. All ingredients should be fully incorporated. The dough should be moist and slightly sticky. 
 In a shallow bowl or small rimmed dish, add coconut sugar and Saigon cinnamon. Whisk to thoroughly combine. 
 Use measuring spoon to scoop out 2 tablespoon of cookie dough and loosely roll into a ball. 
 Roll the cookie dough ball around in the cinnamon sugar mixture until completely coated. 
 Place on parchment covered baking sheet. Press lightly and evenly on the cookie until it's flattened and about 3"x3". Place cookies at least 1" apart.
 Place in middle rack of oven and bake 9-10 minutes until cookie is mostly set and lightly browned on top. Do not over cook! It's better to remove a little under than over cooked. Let cool and enjoy!