Preheat the oven to 350°F and line 2 baking sheets with parchment paper.

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt until combined.

In a large bowl, whisk together the brown sugar, coconut oil, tahini, water, and vanilla until smooth.

Pour the dry ingredients into the bowl of wet ingredients and use a spatula to combine. Fold in the chocolate chips. Use a 2-tablespoon cookie scoop to scoop the dough onto the baking sheets. Bake, one sheet at a time, for 12 to 14 minutes. Remove from the oven and let cool on the baking sheet for at least 10 minutes.