For a thicker smoothie, reduce the milk to 3/4 cup or add another half of a frozen banana. I don’t find the maple syrup necessary, but sometimes my girls have a craving for something super-sweet. Leftover smoothies make excellent popsicles, too! I have even been known to sneak a handful of spinach into this smoothie – as long as you don’t use too much, the smoothie will keep its pretty pink color.