S'more Chocolate Crinkle Cookies

Bahan-bahan (20 porsi)

• 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
• 1/2 cup (100g) granulated sugar
• 1/2 cup (100g) packed light or dark brown sugar
• 1 large egg
• 1 teaspoon pure vanilla extract
• 1 cup (125g) all-purpose flour (spooned & leveled)
• 2/3 cup (55g) unsweetened cocoa powder
• 1 teaspoon baking soda
• 1/8 teaspoon salt
• 1 Tablespoon (15ml) milk
• 1/2 cup (50g) miniature marshmallows, cut in half
• 3/4 cup (75g) graham cracker crumbs (about 5 graham crackers)