Add all the ingredients to your blender and process until smooth and creamy. Enjoy cold.
You may sub the fresh banana for frozen if you don't have any fresh on hand. You'll get a little less banana flavour this way, but still the sweetness it provides. You may also need a touch more milk or some water to get it smooth when using more frozen ingredients.For the milk, you may sub with any milk you have and prefer.Make it kid friendly. Since we eat with our eyes first, kids may be opposed to drinking a green smoothie, so have some fun with it and call it a "Hulk Smoothie" or "Ninja Turtle" or whatever else they might be in to. :)For peanut free, sub the peanut butter with almond butter or another nut butter of choice.To make it completely nut free, sub the peanut butter with sunflower butter or another seed butter of choice, and sub the cashew milk with oat, coconut or soy milk.Use what you have! If you don't have spinach, but you have kale, try that instead. Or if you have fresh mango and strawberries, but not frozen, use those! Make this mango spinach smoothie your own. Just remember to increase or decrease liquids accordingly when adjusting the fresh vs frozen ratio of ingredients.