Easy Scalloped Potatoes With Cheese Sauce Recipe

Time & Servings

• Prep: 20–25 minutes
• Bake: 60–75 minutes
• Rest: 10–15 minutes
• Serves: 6–8

Ingredients

Tip: Shred your own cheese if you can. Pre-shredded blends often contain anti-caking agents that can make sauce less smooth.

For the Potatoes

• 3 pounds russet potatoes (or Yukon Gold), peeled (optional) and sliced thin
• 1 small onion, very thinly sliced (optional but highly recommended for flavor)
• 2 cloves garlic, minced (or 1/2 teaspoon garlic powder)
• 1 tablespoon butter (for greasing the dish)

For the Cheese Sauce

• 4 tablespoons unsalted butter
• 4 tablespoons all-purpose flour
• 2 1/2 cups whole milk (warm is ideal)
• 1 cup half-and-half (or more whole milk)
• 1 teaspoon kosher salt (plus more to taste)
• 1/2 teaspoon black pepper
• 1/2 teaspoon smoked paprika (optional, but adds “wow”)
• 1/4 teaspoon ground nutmeg (optionalsmall amount, big payoff)
• 1 teaspoon Dijon mustard (optionalsharpens cheesy flavor)
• 2 cups shredded sharp cheddar
• 1 cup shredded Gruyère (or Monterey Jack, Fontina, Swiss)
• 1/3 cup grated Parmesan (optional, for extra savory depth)

Optional Topping

• 2–3 tablespoons Parmesan or extra cheddar
• 1–2 tablespoons chopped chives or parsley (for a fresh finish)

Equipment

• 9×13-inch baking dish (or similar casserole dish)
• Saucepan + whisk
• Mandoline slicer (optional but makes slicing faster and more even)
• Foil

Step-by-Step Instructions

1) Prep the oven and pan

1. Preheat oven to 375°F.
2. Butter a 9×13-inch baking dish.

2) Slice the potatoes (the “don’t ruin dinner” step)

1. Slice potatoes thinaim for about 1/8 inch if possible.
   Even slices cook evenly (which is the difference between “creamy perfection” and “why is this crunchy?”).
2. If you’re slicing ahead, keep slices in a bowl of cold water to prevent browning. Then drain and dry well
   (wet potatoes can lead to watery sauce).

3) Make the cheese sauce (béchamel → cheese sauce)

1. Melt 4 tablespoons butter in a saucepan over medium heat.
2. Whisk in 4 tablespoons flour and cook for 1–2 minutes, whisking constantly.
   You want it to look like smooth paste and smell slightly nuttynot raw flour.
3. Slowly whisk in the milk and half-and-half. Keep whisking to prevent lumps.
4. Bring to a gentle simmer and cook until thickened, about 3–5 minutes.
   It should coat the back of a spoonlike a cozy sweater for your potatoes.
5. Reduce heat to low. Stir in salt, pepper, paprika, nutmeg, and Dijon (if using).
6. Turn off the heat, then stir in cheddar, Gruyère, and Parmesan (if using) until melted and smooth.
   Off-heat = smoother sauce and less chance of grainy texture.

4) Assemble the casserole

1. Layer half the potatoes in the dish, slightly overlapping like shingles.
2. Sprinkle half the onion slices and a little garlic over the potatoes.
3. Pour about half the cheese sauce over the layer. Use a spoon to coax sauce into corners.
4. Repeat with remaining potatoes, onion/garlic, and the rest of the cheese sauce.
5. If using extra cheese on top, sprinkle it now.

5) Bake (covered, then uncovered)

1. Cover tightly with foil and bake for 45 minutes.
2. Remove foil and bake 20–30 minutes more, until bubbling and golden on top.
3. Test doneness by inserting a knife in the centerpotatoes should feel tender, not “tiny resistance gym workout.”

6) Rest and serve

1. Let rest 10–15 minutes. This helps the sauce set so servings look like layers, not potato lava.
2. Sprinkle herbs (chives/parsley) if desired and serve warm.

1) The roux prevents watery disappointment

Butter + flour thickens the dairy, so your sauce clings to potato slices instead of pooling at the bottom like a sad puddle.
Potatoes release moisture as they bakethickening the sauce up front keeps the final texture creamy, not soupy.

2) Full-fat dairy helps prevent curdling

Low-fat milk can separate more easily under heat. Using whole milk and a little half-and-half adds stability and richness.
(Your future self, chewing happily, will approve this decision.)

3) Add cheese off heat for smoother melting

Cheese can turn grainy when overheated. Turning off the heat before adding shredded cheese helps it melt gently into the sauce.
If your stove runs hot, let the sauce cool for a minute before stirring cheese in.

4) Freshly shredded melts better

Pre-shredded cheese is convenient, but the coatings that prevent clumping can also make sauces less silky.
If you want the smoothest cheese sauce, buy blocks and shred.

Russet potatoes

High-starch and classic for scalloped potatoes. They soften beautifully and help thicken the sauce as they bake.
If you like a “classic comfort casserole” vibe, russets are your best friend.

Yukon Gold potatoes

Creamier texture, slightly buttery flavor, and they hold shape a bit more. Great if you want more distinct layers.
Many cooks love doing half russet + half Yukon Gold for the best of both worlds.

Problem: Potatoes are still crunchy

• Cause: Slices too thick or uneven.
• Fix: Use thinner slices (about 1/8 inch) and keep them consistent.
• Rescue plan: Cover with foil and bake 10–20 more minutes. Add a splash of milk if it looks dry.

Problem: Sauce is watery

• Cause: Potatoes weren’t dried after soaking, or sauce wasn’t thick enough before baking.
• Fix: Pat potato slices dry and simmer sauce until it coats a spoon.
• Pro tip: Resting 10–15 minutes after baking helps the sauce set.

Problem: Sauce looks grainy or “split”

• Cause: Dairy got too hot, or low-fat dairy was used.
• Fix: Use whole milk/half-and-half and add cheese off heat.
• Pro tip: Bake “low and slow” rather than blasting the oven too high.

Problem: Top is brown but inside isn’t done

• Cause: Oven rack too high, or casserole uncovered too early.
• Fix: Bake covered with foil for the first 45 minutes, then uncover to brown.
• Pro tip: If the top browns too fast, tent foil loosely while the center finishes.

Protein add-ins

• Ham: Fold in 1–2 cups diced cooked ham between layers (great for holiday leftovers).
• Bacon: Sprinkle cooked crumbled bacon on top for smoky crunch.
• Sausage: Browned breakfast sausage turns this into brunch-level comfort.

Flavor boosts

• Herbs: Thyme and rosemary pair beautifully with potatoes and cheese sauce.
• Heat: A pinch of cayenne or sliced jalapeño adds a subtle kick.
• Garlic upgrade: Use roasted garlic for sweeter, mellow depth.

Cheese swaps

• Extra melty: Fontina or Monterey Jack
• Nutty and fancy: Gruyère or Comté
• Classic sharp: Cheddar (always a winner)
• Bold: Smoked Gouda (use half smoked, half mild so it doesn’t overpower)

Make-ahead option

Assemble the casserole (through layering and sauce), cover, and refrigerate up to 24 hours.
When ready to bake, set it out for 20–30 minutes while the oven preheats so it doesn’t go from cold to scorching.
You may need an extra 10–15 minutes of covered bake time.

Leftovers

Cool slightly, then store covered in the refrigerator. Reheat covered with foil at 350°F until warmed through,
then uncover briefly to re-crisp the top. If it seems dry, add a splash of milk before reheating.

Freezing note

Creamy, dairy-rich casseroles can change texture after freezing and thawing. If you do freeze it, expect a slightly less silky sauce.
(Still tasty, just not quite as “restaurant dreamy.”)