In a medium bowl, sift almond flour and whisk in salt and baking soda.
In a heavy bottomed saucepan under medium high healt, melt the butter until it browns. The color should be dark golden with a nutty aroma. This should only take five minutes; just strain any sediment that occurs.
Pour butter into a pie plate, cover, and rest in fridge for 30 minutes.
In stand mixer with paddle attachment, beat the butter for one minute before adding sugar. Cream together for two minutes.
Add egg, yolk, vinegar, and vanilla and mix on medium-high speed, scraping down the sides and bottom of the bowl.
On low speed, slowly beat in the dry ingredients until mixed.
Add chocolate, mixing on low speed for 5-10 seconds until combined.
Chill in refrigerator for at least 3 hours. Baking immediately will cause the cookies to spread and chilling the dough deepens flavor.
Preaheat oven to 350.
Bake for 9-11 minutes and then pull from the oven. They will continue to bake while resting, so a tad bit undercooked is optimal. That’s what makes them chewy. Add chocolate chips into the tops of the warm cookies for added flair.
After five minutes transfer cookies to a cooling rack to cool completely.
Notes
Chilling the dough is crucial in adding flavor combined with ease of actual baking. To ensure freshness and chewy texture, store cookies in an airtight container with a piece of white bread.