Slice potatos 1/8 inch thick and arrange in single layer in a well buttered shallow baking dish, top potatos with the onion and garlic,sprinkle with half the pepper and half the parmesan cheese. Pour half the cream over potatoes. Place fish on top potatos pour lemon juice on fish then add remaing pepper and parmesan cheese, pour remaing cream over fish. Evenly apply crushed potato chips on top of fisk.