Wash the potatoes and cook for 20 minutes. In the meantime clean, wash and cut the peppers into rings. Peel garlic and press it through a garlic press. Heat the oil. Fry garlic and peppers in it. Season with salt, pepper and chilli powder. Drain on kitchen paper.
Whisk eggs and milk. Also season with salt and pepper. Rinse potatoes cold, peel and slice. Fill the potatoes and peppers in flakes in a pan (22 centimetres diameter) coated with oil. Pour egg milk over them and let them simmer in the preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for 25 to 30 minutes. Wash the parsley, cut into strips and sprinkle on the tortilla just before serving. Serve garnished with chilli pepper