Preheat oven to 375°F.

Line two baking sheets with Silpat mats and spray with cooking spray.

Combine flour, baking soda, and cream of tartar in a medium bowl, stirring with a whisk.

Combine 1 cup of sugar and butter in a large bowl; beat with a mixer at medium speed until well blended.

Add the agave, vanilla and egg; beat well.

Gradually add the flour mixture to the sugar mixture, beating just until combined.

Cover and chill for 10 minutes.

In a medium bowl, combine 3 tbsp sugar with cinnamon, stirring with a whisk to combine.

With moist hands, shape dough into 42 (1-inch) balls.

Roll balls in sugar/cinnamon mixture.

Place balls 2 inches apart onto baking sheets (I slightly flattened them).

Bake at 375°F for 5-7 minutes (cookies will be slightly soft).

Cool on baking sheets for 2 minutes.

Remove from pans; cool completely on wire racks.

Enjoy!