Layer sliced potatoes and these 3 ingredients for a baked side I’ll want again

This sliced potato and sharp cheddar slab bake is my stripped-down, no-fuss answer to classic scalloped potatoes. Think of it as the Midwestern cousin of French gratin dauphinois—only we’re leaning into a bold, sharp cheddar instead of the traditional Gruyère or cream-heavy sauce. With just four ingredients, you get all the comfort of layered potatoes and bubbling cheese without making a roux or fussing over the stove. It’s the kind of dish you pull together on a weeknight, yet it’s sturdy and impressive enough to bring to a potluck or set in the middle of a holiday table. If you like recipes that are mostly hands-off but taste like you put in a lot of effort, this is one to keep in your back pocket.

This slab bake is rich and cheesy, so I like to pair it with something fresh or bright to balance things out. A simple green salad with a sharp vinaigrette cuts through the richness nicely, as do roasted or steamed green beans with a squeeze of lemon. It’s also right at home alongside roasted chicken, pork chops, or a seared steak. If you’re going fully vegetarian, serve it with a platter of roasted vegetables—Brussels sprouts, carrots, and broccoli work especially well. For brunch, I’ll sometimes cut the slab into smaller squares and serve it next to scrambled eggs and a bowl of fresh fruit.

Servings: 6

2 1/2 pounds russet or Yukon Gold potatoes, peeled and very thinly sliced (about 1/8 inch)

Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish or similar-sized pan with a bit of oil or butter (not counted in the four ingredients, but helpful for easy release).

Prepare the potatoes: Peel the potatoes and slice them very thinly, about 1/8 inch thick. A mandoline makes this faster and more even, but a sharp knife works fine—just aim for consistent thickness so they cook evenly.

Season the milk: In a measuring cup or small bowl, stir the kosher salt into the milk until dissolved. This lightly seasons the potatoes all the way through as they bake.

Layer the potatoes and cheddar: Spread a thin, even layer of potato slices over the bottom of the prepared baking dish, overlapping them slightly like shingles. Sprinkle a modest handful of grated sharp cheddar over the top. Repeat with more potatoes and cheese, building layers until you’ve used everything, finishing with a generous layer of cheddar on top.

Add the milk: Slowly pour the salted milk evenly over the layered potatoes, tilting the dish slightly if needed so the liquid distributes throughout. You should see the milk just come up around the sides of the potatoes without completely submerging them.

Bake the slab: Cover the dish tightly with foil and bake for 35–40 minutes, until the potatoes are starting to become tender when pierced with a knife. Remove the foil and continue baking for another 20–25 minutes, or until the top is deeply golden, the cheese is bubbling, and a knife slides easily through the center.

Rest and slice: Remove the dish from the oven and let the slab bake rest for at least 10–15 minutes. This rest time allows the cheese and starches to set, so you can slice it cleanly into squares or rectangles.

Serve: Cut the slab into portions using a sharp knife, loosening the edges with a spatula if needed. Taste and add a pinch more salt at the table if desired. Serve warm.

Because this recipe is intentionally minimal, small changes make a noticeable difference. Here are a few ways to customize it while keeping the spirit of a simple, four-ingredient bake:

1. **Cheddar Style & Strength**: Swap the standard sharp cheddar for extra-sharp cheddar if you like a more pronounced tang, or use a white sharp cheddar if you prefer a milder, creamier flavor profile. Smoked sharp cheddar will give the dish a subtle, bacon-like smokiness without adding any meat.

2. **Potato Choices**: Russet potatoes will give you a softer, almost melt-in-your-mouth texture because of their higher starch content, while Yukon Golds hold their shape a bit better and offer a naturally buttery flavor. You can also mix the two for a balance of creaminess and structure.

3. **Richer or Lighter Base**: For a richer, more indulgent slab, replace some or all of the milk with half-and-half or even light cream. If you prefer something a bit lighter, you can use 2% milk; just know the texture will be slightly less velvety.

4. **Make-Ahead Tip**: This dish reheats very well. Bake it fully, let it cool, then cover and refrigerate. Reheat, covered with foil, at 350°F (175°C) until warmed through, then uncover for the last few minutes to re-crisp the top. This makes it a good candidate for prepping the day before a gathering.

5. **Texture Tips**: The thinner and more evenly you slice the potatoes, the more cohesive the slab will be once it’s baked and rested. If you like a deeper golden crust, move the dish to the top rack for the last 5 minutes of baking, watching closely so the cheese doesn’t burn.

6. **Pan Size Adjustments**: For a thicker slab, use a slightly smaller baking dish and add 5–10 minutes to the covered baking time, checking for tenderness. For a thinner, crisper-edged slab, use a larger pan and start checking a bit earlier. These small tweaks let you adapt the bake to what you have on hand and the texture you prefer, while keeping the ingredient list refreshingly short and straightforward.