Ice Cream in a Bag

My son's 1st grade class compiled a recipe book and one of the recipes was ice cream made in zipper bags. I had never heard of this but it was a lot of fun.  Even my littlest (almost 2) was able to stand on a chair at the table and help mush her bag of ice.  So here it is:
Ingredients:
1/2 cup of cream
1 Tablespoon of sugar
1/4 teaspoon of vanilla
3-4 cups of ice
Tablespoons of rock salt
1 quart-sized zipper bag
1 gallon-sized zipper bag

Steps:
1. Combine cream, sugar, and vanilla in the quart-sized bag and seal it closed.
2. Combine closed quart-sized bag, rock salt, and ice in gallon-sized zipper bag and seal the bag closed.
3. Rub bag around.  Mix it, mush it, and kneed it for about 5-10 minutes.  (My little guys lost interest in this part because their hands were too cold so we put gloves on and that helped but the bags that got mixed around the best had the best results.)

Variations:
Try a fruit juice instead of cream for a sorbet-esque result.
Add some sprinkles, cookie crumbles, or fruit for fun flavors.

Each bag made a small serving which was perfect for the kids to eat!