Learned this hearty meal from my Irish grandfather and it is completely foolproof with only 4 ingredients

This oven baked 4-ingredients Kilkenny cottage potatoes dish is the kind of hearty, no-nonsense food my Irish grandfather swore by and taught me to make when I was just tall enough to see over the kitchen table. It’s as simple as can be: thinly sliced potatoes tucked into a glass casserole dish, bathed in savory broth and melted butter, then baked until they’re tender and golden around the edges. With only four ingredients and a completely foolproof method, it’s the kind of recipe you can lean on after a long day, or when you want something comforting that tastes like it’s been passed down through the generations.

Serve these Kilkenny cottage potatoes straight from the glass casserole dish while they’re still bubbling at the edges. They’re wonderful alongside roasted or pan-seared pork chops, baked ham, or a simple skillet sausage. A crisp green salad or buttered peas will balance the richness, and a slice of crusty bread is handy for soaking up the buttery broth at the bottom of the dish. If you’re serving a crowd, pair them with a roast chicken or pot roast and let the potatoes be the sturdy, comforting backbone of the meal.

Servings: 4

2 1/2 pounds russet or Yukon Gold potatoes, peeled and thinly sliced

Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch glass casserole dish with a little butter so the potatoes don’t stick and the edges can crisp nicely.

Peel the potatoes and slice them into thin rounds, about 1/8-inch thick. A sharp knife works just fine; they don’t have to be perfect, just fairly even so they cook at the same pace.

Slice the onion into thin half-moons. These will soften and almost melt into the potatoes as they bake, giving that gentle, homestyle sweetness my grandfather always said made the dish taste like it had been cooking all day.

Layer about one-third of the sliced potatoes evenly in the bottom of the greased glass dish. Scatter one-third of the sliced onions over the potatoes. Sprinkle lightly with some of the salt and pepper.

Repeat the layers two more times: potatoes, onions, then a light sprinkle of salt and pepper each time, finishing with a neat top layer of potatoes. Don’t worry if it looks rustic; that’s exactly how it should be.

In a small saucepan or microwave-safe bowl, melt the butter. Stir the melted butter into the chicken broth until it looks rich and cloudy. This simple mixture is what gives the potatoes their tender, golden character and that cozy cottage flavor.

Slowly pour the buttery broth over the layered potatoes and onions, making sure it seeps down into the corners of the dish. The liquid should come most of the way up the sides of the potatoes, but the very top layer can peek out a bit to brown.

Cover the glass casserole dish tightly with foil. Place it on the middle rack of the preheated oven and bake for 45 minutes. During this time, the potatoes will soften and soak up the broth and butter, just like they used to in my grandfather’s old farmhouse oven.

After 45 minutes, carefully remove the foil and return the dish to the oven. Bake uncovered for another 25 to 35 minutes, or until the potatoes are very tender when pierced with a knife and the top is lightly golden with some browned edges.

Let the Kilkenny cottage potatoes rest for about 10 minutes before serving. The broth will settle into a silky, savory layer at the bottom of the glass dish, and the potatoes will slice out in soft, spoonable squares that hold together just enough to reach your plate.

Taste and adjust the seasoning at the table if needed, adding a pinch more salt or pepper to each serving. Serve warm, spooning some of the buttery broth from the bottom of the dish over the top of each portion.

To keep the spirit of only four core ingredients, think of potatoes, onion, broth, and butter as the heart of the dish, and treat everything else as an optional little nudge. For a slightly richer version, you can swap 1/2 to 1 cup of the broth for whole milk or light cream, though my grandfather preferred the clean flavor of all broth. If you like a bit more color and texture, remove the foil 10 minutes earlier and bump the oven up to 400°F (200°C) for the last stretch to deepen the browning on top. For a vegetarian main, simply use a good vegetable broth and serve with a fried or poached egg on top of each portion. Leftovers reheat beautifully: cover the dish and warm in a 325°F (165°C) oven until hot, or reheat individual servings in a skillet with a spoonful of broth or water to keep them moist. You can also slice the chilled potatoes into neat squares and pan-fry them in a little butter the next day for a crisp-edged breakfast side. If you need to make this ahead, assemble the layers and pour on the buttery broth, then cover and refrigerate up to 8 hours before baking; you may need to add 5 to 10 extra minutes of covered baking time if starting from cold.