Peel and halve the onion and cut into fine strips. Heat 2 tablespoons of oil in a pan and fry the onion strips lightly in it. Add deep-frozen pepper strips and fry everything for 4-5 minutes.
Wash the parsley, dab dry and chop finely, except for a little to garnish. Beat the eggs, milk, half of the parsley, some salt and pepper. Season the paprika vegetables with salt and pepper and pour the egg mixture over them.
Covered and let stand for about 10 minutes at low to medium heat. Meanwhile, for the salad dressing, mix sauce powder, 3 tablespoons of cold water and the remaining oil. Mix the vinaigrette with the salad.
Sprinkle the finished frittata with the remaining parsley and garnish. Add salad separately.