Preheat oven to 350℉ and line 2 large baking sheets with a silicone baking mat or parchment paper.
In a large bowl, whisk together flour, cream of tartar, baking soda and salt.
In a small bowl, combine melted butter, brown sugar substitute and egg. Add to dry ingredients and mix until dough comes together. Dough will be slightly crumbly. Pack into 1 ½ inch balls.
In shallow bowl, whisk together classic sweetener and cinnamon. Roll balls in the cinnamon mixture and place 2 inches apart on prepared baking sheets. Press the balls down slightly with fingers.
Bake for 10 minutes until golden brown. Remove from oven and cool completely on baking sheet.
Notes
Net carbs = 13g total carbs – 3g fiber – 8g sugar alcohols