We have smoothies with breakfast at least twice a week around here. I always use the same recipe and just switch up the fruit. Very easy, and we all love them. This recipe makes 5 cups of smoothie which is exactly enough for us.
1 cup milk
1 cup yogurt (I use vanilla or plain)
1 cup fruit
2 cups ice (which is one tray full)
your choice of sweetener, to taste (we use honey or sugar, if you use plain yogurt you will need more sweetener)
Blend it all together!