1. Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).
2. Place salmon in a greased 9- x 13-inch (20- x 30-centimeter) baking pan. Sprinkle fillets with lemon juice and seasonings.
3. Spread a thin layer of mayonnaise or sour cream over fish. Layer with baked potato slices, overlapping slightly to cover fish. Sprinkle with paprika and spray with cooking spray (or drizzle with oil).
4. Bake covered for 20 minutes. Uncover and bake for an additional 10 minutes. Serve warm or cold.