Place potatoes in a saucepan and cover with salted water. Bring to a boil, cover and cook until tender about 15 to 20 minutes. Drain and cool slightly.

Slice potatos 1/8 inch thick and arrange in single layer in a well buttered shallow baking dish. Top potatoes 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 of potatoes, pour lemon juice on fish then add remaining pepper and parmesan cheese, pour remaining cream over fish. Evenly apply crushed potato chips on top of fish.

Bake in a preheated 375°F oven for 20 to 30 minutes or until fish flakes with a fork.