Prepare cookie mixture: Mix sugars, seed oil, water, and vanilla. Combine flour, baking powder, and baking soda, then add to wet ingredients along with couverture.
Chill dough: Cover and refrigerate the dough for 12 to 24 hours.
Shape and bake cookies: Shape dough into cookies and bake at 170°C for 12 to 14 minutes until they are just set but still soft.