01 - Gently warm milk in a small saucepan over medium heat until it begins to steam, ensuring it does not reach a boil. Incorporate cocoa powder and sugar, whisking until completely dissolved, creating a smooth liquid.
02 - Divide the warm cocoa evenly between two large, heat-safe float glasses or mugs. Place one scoop of vanilla ice cream into each glass. Carefully pour chilled root beer over the ice cream in each glass, allowing the effervescence to subside.
03 - Generously top each float with mini marshmallows. Using a kitchen torch, toast the marshmallows until they achieve a golden-brown hue, softening slightly.
04 - If desired, sprinkle chocolate shavings over the toasted marshmallows for added visual appeal and flavor. Present immediately with a straw and long spoon for optimal enjoyment.