For extra richness, use heavy cream instead of milk in the mashed potato mixture. Experiment with different cheese combinations! Fontina, Gouda, or even a touch of blue cheese can add exciting flavor. To prevent the sliced potatoes from browning too quickly, you can blanch them in boiling water for 2-3 minutes before arranging them on top of the mashed potatoes. If the top is browning too quickly, tent the dish with foil during the last 15-20 minutes of baking.
Mashed Potato au Gratin
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PREP TIME40 mins
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COOK TIME1 hrs 15 mins
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TOTAL TIME1 hrs 55 mins
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SERVING12 People
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VIEWS91
Elevate your potato game with this decadent creation! Buttery, smooth mashed potatoes form a luscious base, crowned with a layer of thinly sliced potatoes baked to golden, cheesy perfection. It's the ultimate comfort food mashup.
Ingridients
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Nutrition
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Carbohydrate55 g
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Cholesterol46 mg
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Fiber6 g
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Protein13 g
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Saturated Fat10 g
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Sodium1437 mg
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Sugar4 g
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Fat16 g
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Unsaturated Fat0 g
DIRECTIONS
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01 Step
Recipe View 5 mins Preheat oven to 450°F (230°C). Butter a 13x9-inch baking dish. (5 minutes)
02 Step
Recipe View 25 mins For the mashed potato layer: Add quartered potatoes to a large pot. Cover with cold water by 2 inches. Add 3 tablespoons salt. Bring to a boil over high heat. Reduce heat to medium and simmer until potatoes are tender when pierced with a knife, about 15-20 minutes. Drain thoroughly. (25 minutes)
03 Step
Recipe View 5 mins Return drained potatoes to the pot. Mash until almost smooth. Add cold butter, salt, and cayenne pepper. Mash until smooth and creamy. (5 minutes)
04 Step
Recipe View 5 mins Add milk and 4 ounces of shredded cheese. Mash and mix until evenly combined. Spread the mashed potato mixture evenly into the prepared baking dish. Smooth the top and season with salt and freshly ground black pepper. (5 minutes)
05 Step
Recipe View 10 mins For the au gratin potato layer: Thinly slice each halved potato into 1/8-inch thick slices. A mandoline slicer works well for this. (10 minutes)
06 Step
Recipe View 15 mins Slightly fan out the potato slices at an angle and arrange them on top of the mashed potatoes. Repeat with the remaining potato halves, overlapping slightly to cover the entire surface. Aim for about 4 rows across, using 2 potato halves per row. Adjust as needed depending on potato size and dish dimensions. (15 minutes)
07 Step
Recipe View 5 mins Generously salt the sliced potatoes. Brush liberally with melted butter. Scatter the remaining 2 ounces of shredded cheese evenly over the top, then sprinkle with grated Parmigiano-Reggiano cheese. (5 minutes)
08 Step
Recipe View 1 hrs Bake in the preheated oven until the sliced potatoes are tender and golden brown, about 1 hour. Let cool slightly before serving. (60 minutes)
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Jayde West
Jun 27, 2025I was a little worried about the potatoes drying out, but they were perfectly cooked and moist. The tips about tenting with foil were very helpful!
Eric Kirlin
Mar 23, 2025This was a huge hit at our Thanksgiving dinner! Everyone raved about how delicious it was.
Cielo Schaden
Jan 29, 2025I made this for a potluck, and it was the first dish to disappear! I added a little garlic powder to the mashed potatoes for extra flavor.
Leann Steuber
Jan 21, 2025The au gratin topping was perfectly crispy, and the mashed potatoes were so creamy. I will definitely be making this again!