– 1 cup (226 grams) unsalted butter, room temperature – 3/4 cup (150 g) granulated sugar – 3/4 cup (150 g) light brown sugar, packed – 1 large egg, plus one egg yolk, room temperature – 2 teaspoons vanilla extract – 2 3/4 cups (345 grams) all-purpose flour, spooned and leveled – 1 teaspoon baking soda – 1 teaspoon corn starch – 1 teaspoon kosher salt – 1/3 cup finely ground graham cracker crumb – 1 1/2 heaping cups chocolate chips (milk, semi-sweet or dark) – about 8 full size marshmallow – 16 soft caramels (I like Werther’s Caramels), sliced into 3 small piece