This isn't my recipe, I had it at a raw foods restaurant a few years ago and fell in love. I have one every morning. It is a fantastic way to eat Kale or even collard greens which are amazing for you, and are more easily digestible in smoothie form. The Vitamin C in this really wakes you up too.
1 frozen banana
3/4 cup frozen mango
4-5 leaves of kale (enough to make the smoothie dark green).
1/4 tsp cinnamon
8oz orange juice (enough juice to make the blender go, or to your desired thickness)
Blend and Bam. Enjoy.