Preheat oven to 350 degrees. Line a baking sheet with parchment paper.
Combine sugar and cinnamon for coating and set aside.
Combine almond flour, coconut flour, baking powder, sea salt and cinnamon in a bowl. Add lemon juice, maple syrup, coconut oil and vanilla and stir well, to form a dough. If mixture is too wet, add more flour.
Form dough into walnut sized balls and roll in sugar/cinnamon mixture. Place on parchment paper. Flatten balls of dough with palm of hand or bottom of a glass.
Bake for 10 minutes, or until slightly brown on bottom.
Arrowroot starch may be substituted for coconut flour. Gluten free oat flour may be substituted for almond flour.