Slow Cooker Salmon and Leek Lasagna Tips, FAQ & printable recipe

Tips for success

For a slightly more golden top, you can finish the lasagna under a broiler for two minutes after it has finished in the slow cooker, provided your slow cooker insert is oven-safe. However, this is optional, as the slow cooker will produce a delicious, tender result on its own.

If you find the leeks are particularly large or tough, sauté them in a small amount of butter for five minutes before adding them to the slow cooker to ensure they are meltingly tender.

If you prefer a more robust flavor, you can add a pinch of freshly grated nutmeg to your béchamel sauce. This classic addition pairs exceptionally well with the sweetness of the leeks and the richness of the salmon.

When layering, try to alternate the direction of the noodles between layers if your slow cooker shape allows, as this creates a more stable structure that holds together better when you are ready to serve the finished dish to your guests.

Variations

• Smoked Salmon Variation: Replace half of the fresh salmon with high-quality smoked salmon for a deeper, saltier profile. Add the smoked salmon during the final hour of cooking to prevent it from becoming too dry.
• Spinach and Salmon: Add two cups of fresh baby spinach between the layers of salmon and leeks. The spinach provides an earthy flavor and additional texture that complements the creamy béchamel sauce perfectly.

Storage and make-ahead

Fridge

Store in an airtight container for up to 3 days.

Freezer

Freeze in a freezer-safe container for up to 1 month.

Reheat

Reheat individual portions in the microwave or in a preheated oven at 350°F (175°C) until heated through and steaming.

Transfer any leftover lasagna into an airtight container. Allow it to cool at room temperature for no more than 2 hours before placing it into the refrigerator. When properly stored in the refrigerator, the lasagna will maintain its quality for up to three days.

Ensure the container is sealed tightly to prevent the pasta from drying out or absorbing other odors from the refrigerator. Avoid storing the lasagna in the original slow cooker insert for extended periods.

You can prepare the components of this dish in advance to save time during the week. The béchamel sauce can be made up to two days ahead and kept in the refrigerator. The leeks can also be washed and sliced, then stored in a sealed bag.

However, it is best to assemble the lasagna immediately before cooking to ensure the noodles do not absorb too much moisture from the sauce before the heat is applied, which can result in an overly soft texture.

Serving ideas

Serve this lasagna hot, directly from the slow cooker or plated onto warm dishes. Because the dish is rich and creamy, it pairs perfectly with a side of crisp, lightly dressed greens or steamed asparagus to add a fresh, crunchy contrast. The bright acidity of a lemon vinaigrette on the side will cut through the creamy béchamel, balancing the flavors and making the meal feel more complete and refreshing for your guests.

When serving, use a wide spatula to lift each slice carefully from the bottom of the cooker, ensuring you capture the bottom layer of noodles and salmon. If you are serving a crowd, this dish can be plated into individual portions before bringing it to the table. Garnish with a light sprinkling of fresh herbs, such as dill or chives, if desired, to provide a pop of color and a fresh, aromatic finish to each serving.

Frequently asked questions

Recipe card

Slow Cooker Salmon and Leek Lasagna

Prep 15 minCook 3 hRest 10 minTotal 3 h 25 minServes 4

Ingredients

• 1 lb salmon fillets, cut into strips
• 2 cups leeks, thinly sliced
• 1 cup emmental cheese, shredded
• 2 cups béchamel sauce, store-bought or made ahead
• 8 ounces no-boil lasagna noodles

Instructions

1. Place a layer of no-boil lasagna noodles at the bottom of the slow cooker. Arrange the salmon strips evenly over the noodles, then scatter the thinly sliced leeks on top of the fish.
2. Sprinkle a generous portion of the shredded emmental cheese over the leeks. Pour the béchamel sauce evenly over the top, ensuring that all noodles are covered to allow them to rehydrate and cook properly in the sauce.
3. Cover the slow cooker and cook on low for 3 hours. Once finished, ensure the salmon has reached an internal temperature of 145°F (63°C). Allow the lasagna to rest for 10 minutes before serving to let the layers set.

Contains: gluten, fish, milk

Estimated nutrition per serving

Calories

480

Protein

28.5 g

Carbohydrates

35 g

Fat

24.5 g

Fiber

2.5 g

Sugar

4 g

Sodium

650 mg

Automatic estimate from the ingredient list, not laboratory-verified.