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3. Make the Cheese Sauce
In a saucepan over medium heat, melt the unsalted butter. Whisk in the all-purpose flour and cook for 1-2 minutes, stirring constantly, until the mixture is smooth and bubbly. Gradually whisk in the heavy cream and continue cooking until the sauce thickens, about 5 minutes. Remove from heat and stir in the shredded cheddar cheese and shredded Swiss cheese until melted and smooth.
4. Layer the Ingredients
5. Bake to Perfection
Cover the baking dish with aluminum foil and bake in the preheated oven for 45-50 minutes, or until the potatoes are tender and the cheese is bubbly and golden brown. Remove the foil during the last 10 minutes of baking to allow the cheese to brown.
6. Garnish and Serve
Once baked, remove the au gratin from the oven and let it cool for a few minutes. Garnish with chopped fresh parsley, if desired, before serving. Slice into squares and serve hot as a delicious main dish or side.
Conclusion:
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