Wash, dry and dice the fillets. Clean and wash the vegetables. Peppers in fine strips, spring onions in rings cut. Clean mushrooms, wash and halve if necessary. Peel garlic and chop finely
Heat the oil in a frying pan. Brown the meat all around. Season with salt and pepper and remove. Sauté the garlic, vegetables and mushrooms in the frying fat. Season with salt and pepper and remove. Heat the milk and sour cream in the pan. Grate cheese roughly, melt half of it in the sauce. Season to taste with salt, sweet paprika and chilli
Mix half the sauce with the meat and vegetables. Heat tortillas in a hot oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: level 3) for approx. 2 minutes. Place 3 tablespoons of filling on each, roll up loosely and place in a large greased casserole dish (approx. 35 cm long). Pour the remaining sauce over it, sprinkle with the remaining cheese
Bake in the oven for about 20 minutes. Wash parsley, cut finely and sprinkle over it