It's called the Green Monster Spinach Smoothie, and I found it on Pinterest.
It was the one time I've actually had all of the ingredients already on-hand for a recipe - woo hoo!
The boys drank their whole cup without stopping for a breath; they LOVED it. I did too.
They asked why it was green; I just told them it had lots of fruits and veggies. They mainly tasted the banana and peanut butter; there was no hint of spinach on the taste buds after drinking this smoothie. Put it in a sippy cup, put it in a coffee mug - hide it however you want - they will love it.
You can find the recipe here - this is going to be our new breakfast smoothie!