Peel and shred the sweet potato using a hand grater or the shredding attachment on your food processor.
Place shredded sweet potato and steel-cut oats in a medium-sized saucepan then add the water.
Cover and cook the sweet potato in the liquid over medium-high heat for about 15 minutes, stirring every couple of minutes to prevent the bottom from burning. It will seem dry at first, but as it steams, the sweet potato will soften and release liquid. Add 1 tbsp of warm water at a time if needed. After about 15 minutes, your sweet potato should be a very soft, porridge-like texture
Divide the sweet potato porridge between bowls and top with berries, bananas, cinnamon, and chia seeds.