Preheat oven to 350 degrees Fahrenheit. Line a baking sheet with parchment paper.
Add flour, salt, baking soda, cream of tartar and pumpkin spice to a small mixing bowl. Whisk until thoroughly combined.
Add vegan butter, sugar, and brown sugar in a separate medium-sized mixing bowl. Cream together with a spatula or wooden spoon until mixture is smooth, 2 or 3 minutes.
Add vanilla and egg replacer. Stir until thoroughly combined.
Pour the flour mixture into butter mixture. Stir until just combined. Wrap bowl in plastic wrap. Chill dough in refrigerator for at least 1 hour.
On a plate, stir the cinnamon and sugar together. Scoop the dough into 2 tablespoon sized balls. Roll in cinnamon-sugar mixture to coat all sides. Roll into smooth ball and place on prepared baking sheet. Flatten slightly with the palm of your hand.
Bake for 10-12 minutes or until browned. Cool on baking sheet for 10 minutes. Then, transfer cookies to cooling rack to cool completely.