Preheat oven to 350 degrees. Line an 8x8 pan with parchment paper. Brown you butter slowly in a saucepan over medium low heat.
Once you get a nice brown color (not burnt) remove from heat. It was hard to get a picture because there was a bit of foam on top.
Add the sweeteners and stir.
Add vanilla, egg, and egg yolk. Whisk well.
Mix the dry ingredients together. Don't add nuts or chocolate chips yet.
Stir in chocolate chips and nuts.
Spread mixture into the prepared pan.
Bake for 15-20 minutes until done. You want it a little golden, but not cooked through.
Allow to cool a little bit and remove from the pan. The parchment paper makes that super easy. Cut when cool enough to not break apart.
