Preheat oven to 325° and line a 9x9 pan with parchment paper
Heat butter in a small saucepan over medium-low heat until nutty brown in color. About 4 1/2 to 5 minutes. You'll see a definite change- it will go from bubbling and noisy to foaming and quiet. As soon as it goes quiet, take it off the heat. I stir with a whisk regularly to prevent burning. Let cook while you mix the other ingredients.
Combine almond flour, coconut sugar, and salt together. Add in cooled butter, egg, cashew butter and vanilla. Stir until well combined and dough is formed. Stir in chocolate chips and press into the prepared pan. Top with additional chocolate chips if desired.
Bake 20-22 minutes, middle will look under done. Let cool and cut into bars.