Boston Salt Cod Potato and Onion Casserole

Indulge in the comforting flavors of New England with this Boston Salt Cod Potato and Onion Casserole, a hearty dish brimming with layers of tender russet potatoes, flaky salt cod, and caramelized yellow onions. This classic recipe is elevated by a rich, herb-infused cream sauce, a golden Parmesan and breadcrumb crust, and a perfect balance of savory and creamy textures. Whether you're looking for a cozy family meal or a crowd-pleasing centerpiece, this casserole delivers satisfying depth and warmth in every bite. With its combination of traditional ingredients and simple yet flavorful preparation, this dish is a true celebration of salt cod cuisine, perfect for your next dinner gathering!

Nutriscore Rating: 56/100

Prep Time:20 mins

Cook Time:50 mins

Total Time:70 mins

Servings: 6

Ingredients

• 1 pound salt cod
• 3 large russet potatoes
• 1 large yellow onion
• 3 tablespoons olive oil
• 2 tablespoons unsalted butter
• 1 cup heavy cream
• 0.5 cup whole milk
• 2 garlic cloves, minced
• 2 tablespoons parsley, chopped
• 0.25 teaspoon freshly ground black pepper
• 1 teaspoon fresh thyme leaves
• 0.5 cup grated Parmesan cheese
• 0.5 cup breadcrumbs

Directions

Step 1

Rinse the salt cod under cold running water. Place it in a large bowl, cover with cold water, and refrigerate. Let it soak for 24 hours, changing the water 2-3 times to remove excess salt.

Step 2

After soaking, drain the salt cod and pat it dry with a kitchen towel. Cut it into 2-inch chunks and set aside.

Step 3

Preheat your oven to 375°F (190°C). Grease a 9x13-inch casserole dish with 1 tablespoon of olive oil.

Step 4

Peel and slice the potatoes into 1/4-inch rounds. Place them in a pot, cover them with cold water, and bring to a boil. Cook for 5-7 minutes, or until just tender. Drain and set aside.

Step 5

Peel and slice the yellow onion into thin rings. Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the onions and cook for 8-10 minutes, stirring frequently, until they are softened and slightly golden.

Step 6

Add the butter and minced garlic to the cooked onions and stir for another minute. Remove from heat and set aside.

Step 7

In a small saucepan, warm the heavy cream and milk over low heat. Stir in the thyme, black pepper, and parsley. Do not boil. Remove from heat.

Step 8

To assemble the casserole, layer half of the potatoes in the prepared dish. Top the potatoes with half of the salt cod pieces, followed by half of the caramelized onion mixture. Repeat the layers with the remaining potatoes, cod, and onions.

Step 9

Pour the warmed cream mixture evenly over the layers in the casserole dish. Sprinkle the top with grated Parmesan cheese and breadcrumbs to create a crispy crust.

Step 10

Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes. Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and bubbling.

Step 11

Let the casserole rest for 5 minutes before serving. Garnish with additional parsley if desired and serve warm.

Nutrition Facts

Serving size	(2042.9g)

Amount per serving	% Daily Value*
Calories	3247.5

Total Fat 167.2g	0%
Saturated Fat 79.9g	0%
Polyunsaturated Fat 4.1g
Cholesterol 606.1mg	0%
Sodium 33665.9mg	0%
Total Carbohydrate 261.8g	0%
Dietary Fiber 20.8g	0%
Total Sugars 26.6g
Protein 160.4g	0%

Vitamin D 53.7IU	0%
Calcium 967.1mg	0%
Iron 20.0mg	0%
Potassium 6002.0mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 47.1%

Protein: 20.1%

Carbs: 32.8%