One of the best chocolate chip cookies I've ever made! If you've never baked with tahini, these are a must try. The tahini adds a richness of flavor and texture that is unreal!
Stop the mixer and scrape down the sides. Then add the egg, egg yolk (or flax egg in place of egg and egg yolk), and vanilla and continue to mix minute, scraping down the sides as needed.
In a small bowl whisk together flour, baking soda, baking powder if vegan version, and salt. With the mixer on low speed, add the dry ingredients until just combined.