Cut the turkey breast into cubes or strips and fry in a pan with sunflower oil.
Cut the peppers and zucchini into cubes and fry them briefly. Put everything in a separate bowl so that the pan is free again. There then melt the butter over low heat. As soon as the butter has melted, stir in the flour. Stir the broth into the mixture. Add the sour cream and stir.
Pour the sauce over the meat and vegetables and cook in the pan for about 20 minutes. Season to taste with salt, pepper and parsley.