Cheesy Salmon Potato Casserole

Begin by submerging potatoes into a substantial container filled with salted water, then initiate boiling. Gradually decrease the heat to a lower medium setting and maintain a gentle simmer until the potatoes are tender, approximately 10 to 15 minutes. Remove from heat.

Next, combine the reserved liquid from cooked salmon with an adequate amount of milk to create a total volume of 2 cups in a measuring container or bowl.

Subsequently, preheat your oven to a temperature of 375 degrees Fahrenheit (190 degrees Celsius). Thoroughly grease a casserole dish with an abundance of cooking oil.

Subsequently, melt butter in a saucepan over a medium-low heat setting. Introduce flour into the melted butter and cook until it has fully dissolved, approximately 1 minute. Gradually add the milk mixture to the butter-flour mixture; cook, constantly stirring, until the sauce has thickened and achieved a smooth consistency, approximately 5 to 10 minutes.

Layer potatoes, salmon, and the sauce, alternating between 1 or 2 times, into the prepared casserole dish.

Combine mayonnaise, Parmesan cheese, Worcestershire sauce, and mustard in a bowl using a whisking motion; pour over the casserole.

Finally, place the casserole in the preheated oven and bake until it is bubbling, approximately 30 minutes.