Mix sprinkles and pink sugar together, then carefully pour on to a large plate.
Cover the rim of a glass mug with a thick coating of icing (color of choice). Dip glass into sprinkle mixture on the plate. This will create a pretty rim of sprinkles! Set aside.
Make hot white chocolate mix according to packet instructions. Mix neon pink food coloring into hot chocolate until desired color is achieved. If the color is too dark, add heated whole milk to lighten the color.
Add whipped cream to the top of hot chocolate. Sprinkle pink sugar on whipped cream, add marshmallows and add icing (color of choice) around the glass. Enjoy!