Here are two versions of a healthy smoothie: one with spinach, one without.
For the spinach smoothie:
Blend 1 banana, cut into chunks, with 1/3 cup cold water and 1/2 apple, cut into chunks. Add 1/2 cup raw spinach and 5 chunks frozen mango.
For the next smoothie, I omitted the spinach. It didn’t change the flavor much.