In a large bowl, cream vegan butter, brown sugar, and all spices until fluffy.
Add flax egg + vanilla, then mix again until combined.
Sift in flour, baking soda, and salt. Mix until a slightly sticky dough forms.
Cover bowl with wrap and chill for 1 hour.
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Scoop dough into 10–12 balls (about 45–50 g each). Roll in granulated sugar if desired.
Place on baking sheet, spaced 2 inches apart. Do not flatten.
Bake for 11–13 minutes, until edges are set and bottoms are lightly golden. Centers should look soft, not raw.
Tap the tray on the counter to deflate cookies for crinkles. For perfect rounds, swirl inside a cookie cutter while still warm.
Cool on the tray 5–10 minutes before transferring to a rack.