S'more Chocolate Chip Cookies

Bahan-bahan (24 porsi)

• 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature
• 3/4 cup (150g) packed light or dark brown sugar
• 1/4 cup (50g) granulated sugar
• 1 large egg, at room temperature
• 2 teaspoons pure vanilla extract
• 2 cups (250g) all-purpose flour (spooned & leveled)
• 2 teaspoons cornstarch
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 and 1/4 cup (225g) semi-sweet chocolate chips
• 12 regular marshmallows, cut in half
• one 4 ounce (113g) semi-sweet chocolate bar, finely chopped
• 1/3 cup (35g) crushed graham cracker crumbs