A coarse sugar such as organic cane sugar offers the best sparkle and crunch, though standard granulated sugar can be used for a subtler coating. Turbinado sugar adds a deeper hue and a hint of molasses flavor, while colored sanding sugar creates a playful twist. For added color, gently fold in ⅓ cup of jimmies or sprinkles before baking, or skip the sugar coating and decorate with a swipe of buttercream once baked. Store cookies in an airtight container at room temperature for up to five days.