1hr · 16 servings INGREDIENTS 3/4 cup unsalted butter, browned 3/4 cup brown sugar, packed 1/4 cup granulated sugar 1 egg + 1 egg yolk 2 teaspoons vanilla extract 1 3/4 cup all purpose flour 1/2 teaspoon baking soda 1/2 teaspoon salt 2/3 cup butterscotch chips 1/3 cup chocolate chips