This green smoothie recipe has a whole cup of spinach leaves, but you barely taste it. Instead, the smoothie is creamy and fruity. Depending on how ripe or sweet your banana and orange are, you may need to add a little extra honey, so add based on your taste. There are many substitutions you can make here, substitute or add different greens, such as kale or other dark leafy green. Also, you could add strawberries, mango, pineapple or other favorite fruit.