Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
In a large mixing bowl, cream together the vegan butter and 1 cup of sugar until light and fluffy.
Add the flaxseed mixture and vanilla extract, and mix well.
In a separate bowl, whisk together the flour, baking soda, cream of tartar, cinnamon, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
In a small bowl, combine the remaining ½ cup of sugar and 1 teaspoon of cinnamon.
Roll the dough into 1-inch balls, then roll each ball in the cinnamon-sugar mixture to coat.
Place the dough balls on the prepared baking sheet, about 2 inches apart.
Bake for 8-10 minutes, or until the edges are lightly golden. Allow to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.