I first tried a green monster about a year ago and love them! My favorite one is as follows :
1 or 2 handfuls of fresh baby spinach
1/2 cup almond milk + 1/3 cup water
Scoop of peanut butter
dash of cinnamon
1/3 apple peeled and chopped
1 frozen banana
Blend and inhale! Here is a pic of my son sporting a green monster mustache!