Mix Sugars, Oil, and Water: In a bowl, combine the brown soft sugar, granulated sugar, seed oil, and water. Mix until the sugar starts to dissolve.
Add Salt and Vanilla: Add a pinch of salt and vanilla extract to the mixture.
Combine Dry Ingredients: In a separate bowl, mix the all-purpose flour with baking soda and baking powder.
Add Couverture to Flour Mixture: Mix the chopped couverture chocolate into the flour mixture.
Combine Wet and Dry Ingredients: Transfer the dry ingredients to the bowl with the wet ingredients and mix until combined.
Refrigerate: Cover the bowl with cling film and refrigerate the dough for 12 to 24 hours to allow the flavors to meld and the dough to firm up.
Shape and Bake: Divide the dough in half and shape into 16 cookies. Place on baking sheets lined with parchment paper. Bake in a preheated oven at 170°C (340°F) for 12 to 14 minutes, until slightly underbaked.
Cool: Allow the cookies to cool on the baking sheet. They will firm up on the outside but remain soft on the inside.