Cheesy Boursin Scalloped Potatoes bring soft potato layers, a creamy garlic-herb sauce, and a golden cheese top to the table. Boursin adds plenty of flavor without a long list of herbs. A little mozzarella makes the top rich and stretchy. Serve this cozy side with a simple roast and something green.
Why I Love This Recipe
This is the kind of side that makes a simple dinner feel special. The sauce slips between the potato slices, so each scoop has creamy layers instead of dry spots. Most of the work happens before the dish goes into the oven.
- Big garlic-herb flavor: Boursin seasons the sauce in one easy addition.
- Tender layers: Thin, even slices cook through without losing their shape.
- Golden topping: Mozzarella melts into a thin blanket with browned spots.
- Easy to plan: Bake it ahead and reheat it for a busy dinner.
What You’ll Need
- Servings: 8 side-dish servings
- Prep Time: 25 minutes
- Cook Time: 1 hour 25 minutes, including sauce preparation
- Rest Time: 15 minutes
- Total Time: 2 hours 5 minutes
- Oven Temperature: 375°F (190°C)
- Baking Dish: 9×13-inch rectangular ceramic baking dish, about 3 quarts
Ingredients:
- 3 pounds Yukon Gold potatoes, peeled and sliced 1/8 inch thick
- 3 tablespoons unsalted butter, divided
- 1/2 cup finely diced onion
- 2 garlic cloves, minced
- 2 tablespoons all-purpose flour
- 2 cups whole milk
- 1/2 cup heavy cream
- 1 (5.2-ounce) package garlic-and-herb Boursin cheese, broken into pieces
- 1/2 teaspoon fine salt
- 1/2 teaspoon ground black pepper
- 1 1/2 cups freshly shredded low-moisture mozzarella, about 6 ounces
- 2 tablespoons finely snipped fresh chives
Use whole milk for a smooth sauce. Freshly shredded mozzarella melts more evenly than shreds with a heavy coating of starch. Salt levels vary among cheeses, so taste the sauce before layering.
Tools You Need
- 9×13-inch rectangular ceramic baking dish with side handles
- Mandoline with a hand guard, or a sharp knife
- Vegetable peeler and wooden cutting board
- Medium saucepan
- Whisk and flexible spatula
- Measuring cups and spoons
- Cheese grater
- Aluminum foil
- Broad serving spatula
How to Make Cheesy Boursin Scalloped Potatoes
Slice evenly, keep the sauce smooth, and check the center before taking the potatoes out of the oven.
Step 1: Prepare the Potatoes and Dish
Heat the oven to 375°F (190°C) with a rack in the middle.
Grease a 9×13-inch rectangular ceramic baking dish with 1 tablespoon unsalted butter.
Peel 3 pounds Yukon Gold potatoes and slice them 1/8 inch thick. Use the hand guard if you use a mandoline.
Keep the slices in a bowl while you make the sauce. Do not rinse the sliced potatoes; their surface starch helps thicken the sauce.
Step 2: Cook the Aromatics
Melt the remaining 2 tablespoons unsalted butter in a medium saucepan over medium-low heat.
Add 1/2 cup finely diced onion and cook for 4 minutes, stirring, until softened without browning.
Add 2 minced garlic cloves and cook for 30 seconds.
Stir in 2 tablespoons all-purpose flour and cook for 1 minute, until no dry flour remains.
Step 3: Make the Boursin Sauce
Slowly whisk 2 cups whole milk into the onion and flour mixture, adding a splash first to smooth out the paste.
Whisk in 1/2 cup heavy cream, 1 (5.2-ounce) package garlic-and-herb Boursin, 1/2 teaspoon fine salt, and 1/2 teaspoon ground black pepper.
Cook over medium-low heat for 3–4 minutes, whisking, until the cheese melts and the sauce lightly coats a spoon. Keep it at a gentle simmer, not a rolling boil.
Take the pan off the heat. The sauce should still pour easily; it will thicken more as the potatoes bake.
Step 4: Layer the Potatoes
Arrange half of the sliced potatoes, about 1 1/2 pounds, in overlapping shallow layers in the greased dish.
Spread half of the Boursin sauce evenly over them, letting it run between the slices.
Add the remaining 1 1/2 pounds potato slices, then spread the remaining sauce over the top. Press the slices gently into the sauce.
Scatter 1 1/2 cups shredded mozzarella (6 ounces) in a thin, even layer across nearly the whole surface.
Step 5: Bake Until Tender
Cover the dish snugly with foil, tenting it slightly so it does not stick to the cheese.
Bake at 375°F (190°C) for 45 minutes.
Remove the foil and bake for 25–30 minutes more, until the top has golden spots and a thin knife slides through the center layers with almost no resistance.
If the top browns before the potatoes soften, cover loosely again and continue in 10-minute rounds. Tenderness matters more than the clock.
Take the dish out of the oven and sprinkle 2 tablespoons finely snipped fresh chives over the melted cheese right away.
Step 6: Rest and Serve
Let the potatoes rest uncovered for 15 minutes so the sauce thickens around the layers.
Use a broad spatula to spoon out soft portions, keeping some browned cheese and chives on each serving. The layers should be creamy and tender, with naturally uneven edges.
Serve alongside roast chicken or baked ham and a crisp green salad, if you like.
Why This Recipe Works (Quick Science)
Thin slices shorten the distance heat needs to travel, which helps the center cook before the top gets too dark. Yukon Gold potatoes hold soft layers well while releasing starch into the sauce.
The flour thickens the milk before baking. Potato starch adds more body in the oven, while the Boursin brings fat, garlic, and herbs. Covering the dish first traps moisture so the slices soften. Removing the foil lets moisture escape and the mozzarella brown. The final rest gives the sauce time to settle between the layers.
Common Mistakes to Avoid
- Uneven slices: Thick pieces stay firm while thin ones turn soft. Aim for an even 1/8-inch thickness.
- Boiling the cheese sauce hard: Gentle heat keeps the dairy smooth.
- Packing the potatoes upright: Lay them in shallow overlapping layers so the sauce reaches between them.
- Judging only by the top: Brown cheese does not mean the center is cooked. Check the middle layers.
- Skipping the rest: Serving straight away leaves the sauce looser and the scoops harder to lift.
What to Serve With Cheesy Boursin Scalloped Potatoes
Roast chicken, baked ham, or roasted turkey all work well with this rich potato side. Add a crisp green salad with a sharp vinaigrette, or simple steamed green beans. Choose lightly seasoned sides so the garlic-herb sauce can stand out.
Substitutions and Variations
- Russet potatoes: Use the same weight and slice thickness. Their layers may be softer and less defined.
- Different topping: Replace the mozzarella with the same weight of freshly shredded Gruyère for a nuttier flavor.
- No fresh chives: Leave them out if needed. The Boursin still adds herbs to the sauce.
- Smaller batch: Halve every ingredient and use an 8-inch square dish. Start checking tenderness earlier.
Make-Ahead Tips
For the most reliable result, bake the potatoes fully before storing. Cool and refrigerate promptly in shallow portions, then cover once chilled. Make them up to one day ahead for serving.
Reheat covered at 350°F (175°C) until the center reaches 165°F (74°C). A larger chilled portion may need 30–45 minutes or longer. Uncover briefly at the end to refresh the cheese. Follow your dish maker’s directions for temperature changes; avoid moving cold ceramic straight into a hot oven.
Leftovers and Storage
Refrigerate leftovers within 2 hours and keep them in an airtight container for 3–4 days. Reheat only what you need, covered, until the center reaches 165°F (74°C). A splash of milk can loosen a dry portion.
Freezing is possible, but the sauce may separate and the potatoes may soften after thawing. Refrigeration gives a better texture.
Macros Information
Estimated per side-dish serving, based on 8 servings. Brands and portion sizes will change these numbers; optional meal pairings are not included.
- Calories: 395
- Protein: 13 g
- Carbohydrates: 36 g
- Fat: 22 g
- Saturated Fat: 14 g
- Fiber: 4 g
- Sugar: 5 g
- Sodium: 470 mg
Frequently Asked Questions (FAQ)
Q: Do I have to peel the potatoes?
A: Peeling gives the smoothest layers. Clean, thin Yukon Gold skins can stay on if you prefer a more rustic texture.
Q: Should I boil the potatoes first?
A: No. This recipe uses raw, thin slices that cook in the sauce. Precooked slices may fall apart during the long bake.
Q: Can I use a different Boursin flavor?
A: Yes. Shallot and chive is a good match. Choose a savory flavor you enjoy and check the sauce seasoning before assembly.
Q: Why are the center potatoes still firm?
A: The slices may be too thick, or the oven may run cool. Cover the dish and keep baking until a thin knife passes easily through the middle.
Q: Why does my sauce look loose?
A: It thickens during the rest. Extra liquid, rinsed potato slices, or potatoes that are not fully cooked can also leave it thinner than expected.
Q: Can I leave out the flour?
A: It is best to keep it for this milk-based sauce. Removing it changes how the sauce thickens and may leave liquid in the bottom.
Q: Is this the same as potatoes au gratin?
A: The names often overlap. This version has both a creamy sauce and a cheese topping, so it shares features with a gratin.
Q: Can I double the recipe?
A: Use two 9×13-inch dishes rather than a deeper layer in one dish. Leave room for heat to move around them and check each center for tenderness.
Q: Can I use glass instead of ceramic?
A: Yes, an oven-safe glass baking dish of the same size works. Follow its maker’s temperature and handling directions, and use tenderness as your final guide.
Final Thoughts
Cheesy Boursin Scalloped Potatoes make a rich, cozy side with a simple sauce and plenty of tender layers. Give the potatoes time to soften and rest, and each scoop will hold a little of that golden cheese top. Leave a comment with what you served alongside them. Happy cooking!