01 -
Set the oven to 338°F (170°C) to prepare for baking.
02 -
Using a mandoline or sharp knife, cut peeled potatoes into thin, uniform slices to ensure even cooking.
03 -
Arrange the potato slices evenly in a baking dish, creating uniform layers until all slices are used.
04 -
Combine the heavy cream with the French onion soup mix in a bowl, stirring until fully integrated.
05 -
Evenly distribute the cream and soup mixture over the layered potatoes, ensuring thorough coating.
06 -
Seal the baking dish tightly with aluminum foil and bake for 90 minutes or until the potatoes are tender throughout.
07 -
Carefully remove the foil and sprinkle grated cheese uniformly over the potato layers.
08 -
Return the dish to the oven and bake uncovered for 10 to 15 minutes until the cheese is melted, bubbly, and lightly golden.
09 -
Remove from oven and serve warm to enjoy the creamy texture and rich flavors.