Step-by-Step Instructions
The secret to this bake is achieving the perfect potato thickness so they cook through at the exact moment the cream finishes reducing.
Preheat your oven to 400°F (200°C). Peel the potatoes and slice them into uniform rounds about 1/8-inch thick. If they are too thick, they won't tenderize in time; if too thin, they will turn to mush.
In a medium bowl, whisk the heavy whipping cream and the entire packet of dry onion soup mix together until completely combined.
Grease an 8x11-inch (or 9x9-inch) baking dish. Layer the potato slices slightly overlapping, like shingles. Pour the seasoned cream mixture evenly over the top, ensuring it seeps down between the layers.
The Two-Stage Bake
50-60 mins
Cover the dish tightly with aluminum foil and bake for 35 minutes to trap steam and tenderize the potatoes. Remove the foil and bake for an additional 15 to 20 minutes, until the top is deeply bronzed, bubbling, and a knife slides effortlessly into the center.
Why the Two-Stage Bake Matters: Keeping the dish covered initially allows the liquid to boil and cook the potatoes through without drying out. Uncovering it for the final stretch triggers the Maillard reaction, transforming the top layer into a rich, caramelized crust.
Let the dish rest for about 5 to 10 minutes before serving. This allows the sauce to cool slightly and thicken up, ensuring every scoop stays beautifully together on the plate
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