This creamy Vegan Purple Sweet Potato Smoothie tastes like dessert but is packed with nourishing ingredients to keep you full and energized. Purple sweet potatoes contain vitamin B6, vitamin C, potassium, fiber and are rich in anthocyanins, the pigments that give them their gorgeous color. This no-fruit smoothie skips the usual bananas and berries, making it a delicious way to add a vegetable to your breakfast routine.