Peel and chop sweet potato in small cubes (around 1 cm). Place in a baking tray lined with baking paper or foil. Roast until it starts to brown (around 30 minutes).
While sweet potato roasts, slice onion and roughly chop kale. Slice chorizo.
Heat up a pan at medium heat. Add chorizo. When fat starts to render, add onions. Continue cooking until chorizo is fully cooked and onions are browned, stirring often.
Add kale and cook for a couple of minutes, until just wilted. Add sweet potato and mix well.
Make 4 wells in the pan and add eggs. Cover with a lid and cook until whites are set, around 10 minutes.
Season eggs with salt and pepper.
Serve garnished with parsley and with toast on the side, if you want.