01 -
First things first, get those potatoes ready! I peel about 3 pounds of Yukon Golds, then slice them thinly, around 1/8-inch thick. A mandoline makes this super easy and consistent, but a sharp knife and a steady hand work just fine. I always tell myself to be careful with the mandoline; I've had a few close calls, oops! Once sliced, I give them a quick rinse under cold water to remove excess starch, then pat them really, really dry. This helps prevent a gummy texture in your creamy scalloped potatoes, trust me, I learned that the hard way.
02 -
Now for the star of the show: the sauce! In a medium saucepan, I melt 4 tablespoons of unsalted butter over medium heat. Once it's shimmering, I toss in 2 minced garlic cloves and let them get fragrant for about a minute—don't let them brown! Then, I whisk in 4 tablespoons of all-purpose flour, cooking it for another minute or so to get rid of that raw flour taste. Slowly, I whisk in 3 cups of whole milk, a little at a time, until it's smooth and lump-free. I bring it to a gentle simmer, whisking constantly, until it thickens, about 5-7 minutes. This is where patience pays off; rushing it can lead to a thin, sad sauce for your creamy scalloped potatoes.
03 -
Once the sauce is thick and lovely, I take it off the heat. This is where I season it with 1 teaspoon of salt, 1/2 teaspoon of freshly ground black pepper, and a small pinch of freshly grated nutmeg. Honestly, that nutmeg is non-negotiable for me! Then, I stir in 1 cup of shredded Gruyère cheese until it's completely melted and smooth. Taste it here, hon! Adjust the seasoning if needed. You want it flavorful, but not overly salty, as the potatoes will absorb some of that deliciousness.
04 -
Preheat your oven to 375°F (190°C). I lightly butter a 9x13 inch baking dish. Then, I arrange about a third of the sliced potatoes in a single, slightly overlapping layer at the bottom. Pour about a third of the creamy cheese sauce evenly over the potatoes. Repeat this layering two more times, ending with a final layer of sauce. I always try to make sure the top layer of potatoes is mostly covered by sauce to prevent them from drying out. This is where my kitchen can get a little messy, but it's all part of the process!
05 -
Cover the baking dish loosely with aluminum foil. Pop it into the preheated oven and bake for 45 minutes. The foil helps steam the potatoes, making them wonderfully tender. After 45 minutes, I remove the foil, sprinkle another 1/2 cup of shredded Gruyère cheese over the top, and continue baking for another 20-30 minutes, or until the potatoes are fork-tender and the top is beautifully golden brown and bubbly. Oh, the smell that fills the kitchen at this point is just incredible!
06 -
This is perhaps the hardest step for me: waiting! Once your creamy scalloped potatoes are out of the oven, let them rest for at least 10-15 minutes before serving. This allows the sauce to set a bit and prevents it from being too runny when you spoon it out. Trust me, it's worth the wait for that perfect, cohesive slice. I often garnish with a sprinkle of fresh parsley for a bit of color, because we eat with our eyes first, right?