Clean the peppers and cut into large pieces. Peel and dice the onion. Peel the garlic and press it through a press.
Heat olive oil in a pan. Fry the peppers in it for 2-3 minutes. Add onions and garlic and fry briefly. Season with salt, pepper and oregano. Add the chopped tomatoes and stock. Then bring to the boil and simmer for 4-5 minutes.
Put the tortellini in plenty of boiling salted water and cook for about 1 minute. Drain.
Season the sauce again with salt and pepper and mix together with the tortellini. Put everything in a greased baking dish and sprinkle with crumbled sheep cheese and parmesan.
Then bake in a preheated oven at 200 ° C top / bottom heat (convection: 175 ° C) for about 20 minutes. Serve hot.