Instructions: Melt 3 tablespoons butter in a medium skillet over medium heat. Add onion, garlic, salt, and pepper. Saute until onion is transparent; remove from heat and set aside.

Preheat oven to 375 F. Grease a 2-quart baking dish.

Drain potatoes and layer in baking dish alternately with onion mixture, salmon, Gruyere cheese and Parmesan cheese, ending with potato slices. Dot with remaining 1 tablespoon butter.

Cover dish with aluminum foil and bake for 30 minutes. Remove foil and continue to bake until the potatoes are tender, approximately 15 minutes. Set aside for 10 minutes to allow cheese to set.

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