Cut the sausages into pieces. Heat 1 tablespoon of oil in a frying pan. Fry the sausages for 4-5 minutes, turning them until brown, then remove them. Clean and wash the zucchini, cut them in half lengthwise and slice them. Peel, wash and chop the potatoes
Heat 1 tablespoon of oil in a clean, ovenproof, coated pan with a high rim (approx. 26 cm Ø). Fry the potatoes for 6-8 minutes while turning. Whisk eggs and milk, season with salt, pepper and a little nutmeg. Wash the oregano, shake dry, pluck the leaves from the stalks and cut them coarsely, stir into the eggs
Add the zucchini to the potatoes and fry for 2-3 minutes. Add the pasta and sausages to the pan, fry everything through. Pour the egg mixture over the top, allow to set for approx. 5 minutes at low heat, then cook in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 15-17 minutes until the mixture is firm
Take out, slide onto a board, let it cool down. Cut the frittata into pieces and serve