The best treat I can remember making when I was young, were banana milk shakes. If you've never made them, you have to try them. I planed on having them today because it has been so hot in our house. It wasn't that hot with all the rain, but I still enjoyed my milk shake.
Here's how we made them (estimates, because we never measured anything)
4 Frozen Bananas (make sure you peel them before you freeze them)
2 Cups Milk
2 Tb Peanut butter
1 Tb Vanilla (I just used a instant breakfast instead)
Blend and serve :)