In the bottom of a blender, add orange juice, banana, mango, and carrots. Blend until smooth.
Mango: To substitute frozen mango, thaw it before adding to the blender. The frozen carrots make the texture thick enough, I think, and thawed or fresh mango results in a creamy consistency. Any variety of mango will do. To test for ripeness, squeeze the mango gently, the National Mango Board suggests. Similar to an avocado or a peach, a ripe mango will give slightly when you squeeze it. It should smell fruity at the stem when ripe, too.
Frozen carrots: Buy them already frozen or freeze fresh carrots when they're in season.
Yield: One recipe makes enough for 2 smoothies, possibly more if you're sharing with kiddos.
Storage: Store leftovers covered in the refrigerator for up to 4 days. Some separation may occur, so shake or stir to combine before enjoying.