Step 1: What you will need...
1 cup milk
1 tablespoon vanilla extract
1/2 cup sugar
3 cups of clean snow
-gloves (You don't want your hands going numb while picking up snow!)
Step 2: Go outside & let's get started!
It is important that when selecting your snow that you choose a clean area. Do not collect snow from an area where pets go potty (yuck!) Other snow to avoid is that where people have walked on or cars have been. I suggest using a top layer of snow from a deserted area nearby.
Since your bowl has been stored inside at room temperature, it is a good idea to chill your bowl a bit by submerging it in the snow. (2 minutes should be long enough)
Step 3: Add the good stuff
If you are doing this with your children, have them help add the ingredients. They will love helping, plus they are doing something productive!