In a blender, add the ice cream, malted milk powder, milk and toasted marshmallows.
Blend using the milkshake setting until the marshmallows are blended in with all the ingredients (about 2 to 3 minutes depending on the type of blender used).
Pour the malted milkshake into juice glasses. Garnish with a floating toasted marshmallow on top of each milkshake. Serve right away while cold.