Cook the rice in boiling salted water for about 20 minutes. In the meantime, cut off the lid of the bell peppers. Clean and wash the vegetables. Soak the rolls in cold water. Peel and finely chop the onion.
Knead the minced, squeezed out roll, onion, egg, tomato paste and crumbled chillies with the dough hooks of the hand mixer. Season with salt, pepper and paprika. Wash the herbs, dab dry, chop or cut into small rolls.
Heat the fat in a pot, sauté the flour in it and deglaze with milk and stock. Season to taste with salt and pepper and bring to the boil. Drain rice and let it drain, mix with herbs and peas and fill into an ovenproof dish. Fill the peppers with minced dough, put the lid on top. Arrange on the rice. Cover with sauce and sprinkle with cheese. Bake in the preheated oven (electric cooker: 200°C/ gas: level 3) for about 45 minutes