Place potatoes in a large shallow microwave-safe dish. Cover with damp paper towel and microwave on High/100% for 4-5 minutes until tender. Drain. Set aside. Place onions on a microwave-safe plate, cover and microwave on High/100% for 2 minutes until softened.
Heat 1 tbs of the oil in a deep 24cm (base) frying pan over high heat. Add mushrooms and cook for 4 minutes. Remove to a plate. Add remaining oil, chorizo and warm potatoes and cook for 5 minutes until light golden. Return the mushrooms to the pan, add onions and capsicum and stir to combine.
Reduce heat to medium-low and pour over the eggs. Crumble over the ricotta. Cover and cook for 8-10 minutes until almost set.
Preheat grill on medium-high. Place the pan under the grill and cook for 4 minutes until firm and light golden on top. Season with pepper, cut into wedges and serve.