Pre-heat oven to 350°F Place parchment paper on a baking sheet.
Melt 10 tablespoons butter in a skillet on medium heat. Mix butter in a saucepan over medium heat until it begins to brown. This should take about 3-4 min . Put butter in a bowl. Add the remaining butter to the bowl.
Mix sugar, 1/4 cup brown sugar and flour in a separate bowl. Add baking soda and baking powder to the bowl.
Mix remaining brown sugar with salt in butter. Whisk until smooth. Add egg yolk and vanilla to the butter.
Mix butter mixture with dry ingredients and stir until you get a dough.
You can either roll the dough to 1/2 inch thick using a cookie cutter or roll it into a ball and place it on a baking sheet. Sprinkle sugar on top.
Bake cookies for 12-14 min or until they begin to set.
