INGREDIENTS
3/4 cup
unsalted butter, melted
1 cup
light brown sugar
1/2 cup
granulated sugar
1 tbsp
vanilla extract
1
large egg
1
additional egg yolk
2 cups
all-purpose flour
1/2 tsp
baking soda
1/2 tsp
salt
1 cup
milk chocolate chips
1 cup
semisweet chocolate chips