In a 3 quart saucepan, on low heat, combine evaporated milk, ranch dressing mix and pepper. Stir until dry ingredients are dissolved. Simmer uncovered about 25 minutes. Stir frequently. Sauce will thicken slightly.
Layer half the lasagna noodles, chicken sauce, and cheese in a well greased 9 X 13 in. pan. Repeat layers.
Bake at 350 for 35-40 minutes, until bubbly. Let rest about 10 minutes before serving.
If desired, garnish with chopped parsley and grated parmesan cheese.