Prepare the leafy greens: Rinse the chopped greens and place them in a small saucepan. Cover and steam over low heat for about 3 minutes, or until just wilted.
Add to a blender the nondairy milk, steamed greens, prunes, frozen mango, almond butter, pumpkin seeds, chia seeds, protein powder, turmeric, black pepper, and cinnamon (if using).
Blend on high until smooth, using a tamper if needed to help everything blend evenly. Add more milk or coconut water until the desired consistency is reached.
