Preheat your oven to 160 degrees Celsius (320 degrees F)
Pre-heat a pot or pan over high heat, then add your spinach. Keep stirring the spinach, once it's completely wilted down, transfer onto a sheet of kitchen paper in into a sieve over a bowl.
Get an ovenproof non-stick pan (preferably around 10 inches in diameter) and add your chorizo, then start heating the pan over medium-high heat.
Once the spinach has cooled down, pick it up and spend a good minute squeezing out the liquid. Roughly chop the spinach up and set aside.
Put your spinach, chorizo and sweet potato in the pan containing the chorizo fat, then mix the 3 ingredients together.
To check if the frittata is cooked, stick a skewer or small knife in the middle. If it comes out clean, the frittata is cooked. Transfer into a platter or board and enjoy!!