Step 1

Preheat oven to 350 degrees Prepare a  baking sheet with parchment paper.

Step 2

In a small pot, melt 10 tablespoons butter over medium heat. Stir constantly until butter starts to brown, about 3-5 minutes. Once butter starts to brown, remove pot from heat, and add in the remaining 4 tablespoons of butter. When the additional butter has melted,  stir in 1.5 cups of brown sugar. Stir until smooth. Whisk in egg, egg yolk, salt and vanilla. Set aside.

Step 3

In a separate large bowl whisk together 1/4 cup sugar, 1/2 cup brown sugar, flour, baking soda, and baking powder.

Step 4

Combine butter mixture with dry ingredients, stirring until a dough forms.

Step 5

Roll into a balls. Place 1/4 cup of sugar in a small bowl . Roll cookie balls in sugar until coated and place on cookie sheet.  Bake for 12-14 minutes, or until cookies JUST begin to set. Do not over bake so they stay soft. Cracks of cookies will look undercooked, but once they sit out on the drying rack, they will firm up, but stay soft.