Brown Butter Toffee Chocolate Chip Cookies

3 Preheat the oven to 350F and line two baking sheets with parchment paper. 
0 In light saucepan heat butter over medium heat to brown it, stirring constantly until the butter begins to foam and turns a golden brown. It should emit a nutty aroma. 
1 In a large mixing bowl, combine the cooled brown butter, brown sugar, and white sugar. Whisk until combined. Add the egg, egg yolk, and vanilla. 
2 Next pour the flour, baking soda and salt, folding until just combined . Carefully fold in the chocolate and toffee pieces.
4 Scoop the cookies into balls and places 2 inches apart on the baking sheet. 
5 Cook for 10 -12 minutes or until the edges are golden brown and the center is a bit gooey.