Step 6: Add the Cheese
Lower the heat.
Add 1 cup of shredded cheddar cheese to the sauce and stir until melted.
Use freshly shredded cheese if possible. Pre-shredded cheese can contain anti-caking ingredients that sometimes make sauces less smooth.
Once the cheese is fully melted, remove the sauce from the heat.
The sauce should be thick, creamy, and cheesy.
Step 7: Layer the Potatoes
Arrange one layer of potato slices in the bottom of the prepared baking dish. Slightly overlap the slices so there are no large gaps.
Pour a small amount of the cream sauce over the potatoes.
Sprinkle a little shredded cheddar and mozzarella on top.
Repeat the layers: potatoes, sauce, and cheese, until all the potatoes are used.
Pour the remaining sauce over the top, making sure it covers the potatoes well.
Step 8: Add the Final Cheese Topping
Sprinkle the top with cheddar, mozzarella, and parmesan cheese.
The cheddar gives flavor, mozzarella gives a soft melted texture, and parmesan helps create a golden, slightly crisp surface.
For extra color, sprinkle a little paprika over the top.
Step 9: Bake Covered
Cover the baking dish tightly with foil.
Bake for 40 minutes.
Covering the dish at the beginning traps steam and helps the potatoes cook through without drying out.
Step 10: Bake Uncovered
After 40 minutes, remove the foil carefully.
Continue baking for another 25 to 35 minutes, or until the potatoes are tender and the top is golden brown.
To check if the potatoes are done, insert a knife into the center. It should slide through easily with no resistance.
If the top browns too quickly before the potatoes are fully cooked, cover loosely with foil and continue baking.
Step 11: Let the Dish Rest
Remove the potatoes from the oven and let them rest for 10 to 15 minutes before serving.
This step is important because the sauce thickens as it cools slightly. If you serve it immediately, the sauce may be too runny.
Resting also makes the slices easier to scoop and serve.
Step 12: Garnish and Serve
Sprinkle chopped parsley over the top for a fresh finish.
Serve warm as a side dish with roasted meat, baked ham, chicken, turkey, or vegetables.
The top should be golden and cheesy, while the inside should be soft, creamy, and layered with rich sauce.
Helpful Tips for Perfect Scalloped Potatoes
Slice the potatoes thinly and evenly. This is the most important step for even cooking.
Do not rinse the potato slices after cutting. The natural starch helps thicken the sauce.
Use whole milk and cream for the best texture. Low-fat milk may make the sauce thinner.
Cover the dish during the first part of baking so the potatoes become tender.
Let the dish rest before serving so the sauce has time to set.
Use a mix of cheeses for better flavor and texture.
Flavor Variations
For a ham and potato version, add diced cooked ham between the layers.
For a bacon version, sprinkle crispy bacon pieces into the layers or on top.
For a garlic herb version, add thyme, rosemary, or parsley to the cream sauce.
For a spicy version, add cayenne pepper, chili flakes, or pepper jack cheese.
For a loaded potato version, top with bacon, green onions, and sour cream after baking.
For a vegetable version, add thinly sliced onions, mushrooms, spinach, or broccoli.
Storage and Reheating
Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, cover with foil and warm in the oven at 350°F / 175°C until heated through.
You can also reheat individual portions in the microwave, but the oven gives a better texture.
If the sauce becomes too thick after chilling, add a small splash of milk before reheating.
Can You Make It Ahead?
Yes. You can assemble the dish a few hours ahead and keep it covered in the refrigerator before baking.
For best results, bake it fresh when ready to serve. If baking from cold, add about 10 to 15 extra minutes to the cooking time.
You can also bake it completely, cool it, refrigerate it, and reheat it the next day.
Final Thoughts
Easy Scalloped Potatoes, or Creamy Au Gratin Potatoes, are a classic comfort-food side dish made with simple ingredients and rich flavor. Thin potato slices, creamy garlic sauce, and melted cheese come together to create a warm, golden, satisfying dish.
It is creamy inside, cheesy on top, and perfect for both everyday dinners and special occasions. Once you learn the basic method, you can easily customize it with ham, bacon, herbs, onions, or extra cheese.
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