A comforting and hearty dish combining potatoes, sausages, and a creamy cheese sauce, perfect for a family dinner.
Preheat your oven to 350°F (175°C).
Preheating the oven ensures even cooking from the start.
Peel and slice the potatoes into thin rounds.
Uniform slices help the potatoes cook evenly.
In a saucepan, melt the butter over medium heat and sauté the chopped onion until soft.
Stir constantly to prevent the butter from burning.
Stir in the flour and salt, cooking for 1 minute to form a roux.
Cooking the roux removes the raw flour taste.
Gradually whisk in the milk, cooking until the sauce thickens.
Keep stirring to avoid lumps in the sauce.
Add the grated cheese, parsley, and mustard, stirring until the cheese melts.
Adding the cheese off the heat prevents it from becoming grainy.
Layer the potato slices and sliced sausages in a casserole dish.
Overlap the potato slices slightly for a nice presentation.
Pour the cheese sauce evenly over the potatoes and sausages.
Ensure the sauce covers all the layers for even flavor.
Cover the dish with foil and bake for 35 minutes.
Covering the dish prevents the top from drying out.
Remove the foil and bake for an additional 10 minutes to brown the top.
Browning adds a delicious crust to the dish.
Let the casserole rest for 5 minutes before serving.
Resting allows the flavors to meld and makes serving easier.
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