1. Scoop out snow into a medium bowl.
2. Add the milk, sugar and banana, and stir. Eat immediately.
One could totally play around with this recipe, too; mixing it all in an icecream machine to change the texture, adding frozen berries, etc. You could also run it through a blender and have a smoothie.
Source of recipe: Our town was recently visited by a huge blizzard, giving us around 2 feet of snow outside. I decided to experiment. Admittedly, the icecream gets soupy pretty fast, but it still tastes pretty good.