When you want a cozy dinner that feels special but still simple to make, Potato and Salmon Gratin is the perfect choice. Tender slices of potato bake in a creamy, garlicky sauce with flaky salmon and a golden, cheesy top that’s irresistible straight from the oven.
Unlike heavy casseroles, this gratin balances richness with a light, savory seafood flavor. It’s ideal for family dinners, holiday tables, or anytime you want a warm, satisfying meal that looks impressive with minimal effort.
Ingredients
Serves 6
Gratin Base
- 2 lb (900g) Yukon gold or russet potatoes, peeled and thinly sliced
- 1 lb (450g) salmon fillet, skin removed, cut into bite-size chunks
- 1 small onion, thinly sliced
- 2 cloves garlic, minced
- 1 tablespoon olive oil or butter (for sautéing)
Creamy Sauce
- 1 1/2 cups (360ml) milk (whole or 2%)
- 1 cup (240ml) heavy cream (or half-and-half for lighter)
- 2 tablespoons (16g) all-purpose flour
- 1 teaspoon Dijon mustard (optional, but excellent)
- 1/2 teaspoon salt (adjust to taste)
- 1/2 teaspoon black pepper
- 1/2 teaspoon paprika (optional)
- 1 tablespoon fresh lemon juice (optional, for brightness)
- 1 tablespoon chopped dill or parsley (optional)
Cheese Topping
- 1 1/2 cups (150g) shredded Gruyère or mozzarella
- 1/2 cup (50g) grated Parmesan
- Optional: 1/2 cup breadcrumbs for extra crunch
Preparation Time
- Prep time: 20 minutes
- Cooking time: 45–55 minutes
- Resting time: 10 minutes
- Total time: About 1 hour 20 minutes
Step-by-Step Instructions
Step 1: Preheat and Prep
Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish (or similar).
Step 2: Sauté Aromatics
In a skillet, heat olive oil or butter. Sauté onion for 3–4 minutes until softened. Add garlic and cook 30 seconds. Set aside.
Step 3: Make the Creamy Sauce
In the same pan, whisk flour into the milk and cream over medium heat. Cook, whisking, until slightly thickened (about 3–5 minutes).
Stir in Dijon mustard (if using), salt, pepper, paprika, lemon juice, and herbs.
Step 4: Layer the Gratin
Layer half the sliced potatoes in the baking dish. Sprinkle with half the onion/garlic mixture.
Add half the salmon pieces. Pour over a bit of sauce. Repeat layers with remaining potatoes, aromatics, salmon, and sauce.
Step 5: Add Cheese
Top with shredded cheese and Parmesan. Add breadcrumbs if desired.
Step 6: Bake
Cover with foil and bake for 35 minutes. Remove foil and bake an additional 10–20 minutes, until potatoes are tender and the top is golden and bubbly.
Step 7: Rest and Serve
Let gratin rest for 10 minutes before slicing. This helps it set and makes serving easier.
Serving Suggestions
- Serve with a crisp green salad and lemon vinaigrette.
- Pair with steamed asparagus, green beans, or sautéed spinach.
- Add lemon wedges on the side for fresh brightness.
- Serve with crusty bread to scoop up the creamy sauce.
- For a brunch-style meal, pair with eggs and fresh fruit.
Nutritional Highlights
| Nutrient | Per Serving (1/6 gratin) |
|---|---|
| Calories | 520 |
| Protein | 28 grams |
| Total Fat | 30 grams |
| Saturated Fat | 15 grams |
| Carbohydrates | 35 grams |
| Sugars | 4 grams |
| Fiber | 3 grams |
| Sodium | 620 milligrams |
Nutritional Notes:
- Salmon provides high-quality protein and omega-3 fats.
- Potatoes add potassium and satisfying carbs for a hearty meal.
- Using half-and-half instead of heavy cream can reduce richness while keeping it creamy.
Tips for the Best Gratin
- Slice potatoes thin and evenly for consistent cooking.
- Don’t overcook salmon before baking—let it cook gently in the gratin.
- Cover first to soften potatoes, then uncover to brown the top.
- Rest before cutting to keep portions neat.
- Add a little lemon juice to brighten the creamy sauce.
Variations to Try
- Smoked Salmon Gratin: Use smoked salmon stirred in after baking for a bold flavor.
- Spinach Addition: Layer in fresh spinach or sautéed kale for extra greens.
- Cheese Swap: Try cheddar + Parmesan for a sharper flavor.
- Lighter Version: Use 2% milk + half-and-half and reduce cheese slightly.
- Extra Crunch: Add buttery breadcrumbs or crushed crackers on top.
This Potato and Salmon Gratin is the perfect comfort-food bake: creamy, savory, and topped with a golden, cheesy crust. It’s hearty enough for dinner, elegant enough for guests, and simple enough to make anytime you want a warm, satisfying meal.
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