Step 5: Add the Milk and Cream
Slowly pour in the milk while whisking constantly. Add it little by little at first to prevent lumps.
Once the milk is mixed in, pour in the heavy cream.
Continue whisking until the sauce becomes smooth. Let it simmer gently for 3 to 5 minutes, or until it begins to thicken.
Keep the heat medium-low. Do not boil the sauce too hard because dairy can separate.
Step 6: Add the Cheese and Seasoning
Lower the heat and add the parmesan cheese.
Stir until the cheese melts into the sauce. Add salt, black pepper, onion powder, Italian seasoning, and paprika if using.
If you want an extra creamy and stretchy texture, add mozzarella cheese. For a sharper flavor, add cheddar.
Taste the sauce and adjust the seasoning. Remember that parmesan is salty, so add salt carefully.
The sauce should be creamy, smooth, garlicky, and slightly thick.
Step 7: Layer the Potatoes
Place one layer of sliced potatoes in the prepared baking dish. Slightly overlap the slices so they cover the bottom evenly.
Spoon some of the garlic parmesan sauce over the potatoes.
Add another layer of potatoes, then more sauce. Continue layering until all the potatoes and sauce are used.
Make sure the top layer is covered with sauce so the potatoes do not dry out while baking.
Sprinkle extra parmesan or mozzarella on top for a golden cheesy crust.
Step 8: Bake Covered
Cover the baking dish tightly with foil.
Bake for 40 minutes.
Covering the dish helps trap steam, which cooks the potatoes until they become soft and tender.
Step 9: Bake Uncovered
After 40 minutes, remove the foil.
Return the dish to the oven and bake for another 25 to 35 minutes, or until the top is golden brown and the potatoes are fully tender.
To check, insert a knife into the center. If it slides through easily, the potatoes are done.
If the top browns too quickly but the potatoes still need more time, loosely place the foil back over the dish and continue baking.
Step 10: Rest Before Serving
Remove the scalloped potatoes from the oven and let them rest for 10 to 15 minutes before serving.
This step is important. The sauce thickens as it rests, making the layers easier to scoop and serve.
If you serve it immediately, the sauce may be too loose.
Step 11: Garnish and Serve
Sprinkle chopped parsley over the top for freshness and color.
Serve the scalloped potatoes warm. They pair beautifully with roasted chicken, steak, ham, turkey, meatloaf, grilled fish, or vegetables.
They are also excellent as part of a holiday meal with gravy, salad, rolls, and roasted meats.
Tips for the Best Scalloped Potatoes
Slice the potatoes evenly so they cook at the same time.
Do not make the slices too thick. Thick slices take longer to bake and may stay firm in the center.
Use freshly grated parmesan if possible. It melts better and gives a smoother sauce.
Let the dish rest before serving. This helps the sauce set.
Do not rush the baking time. Scalloped potatoes need enough time for the layers to become tender.
For extra flavor, rub the inside of the baking dish with a cut garlic clove before adding the potatoes.
Flavor Variations
For a smoky version, add cooked bacon pieces between the layers.
For a sharper cheese flavor, mix parmesan with cheddar or Gruyère.
For a herb version, add fresh thyme, rosemary, or parsley to the sauce.
For a spicy version, add red pepper flakes or a pinch of cayenne pepper.
For a richer holiday version, use half-and-half or more heavy cream instead of milk.
Storage and Reheating
Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, place the potatoes in the oven at 350°F / 175°C until warmed through. Cover with foil so they do not dry out.
You can also reheat individual portions in the microwave, but the oven gives the best texture.
Freezing is possible, but the sauce may become slightly grainy after thawing because of the dairy.
Final Thoughts
Creamy Garlic Parmesan Scalloped Potatoes are rich, comforting, and full of flavor. Thin potato slices are layered with a smooth garlic cream sauce, parmesan cheese, and seasonings, then baked until soft inside and golden on top.
This dish is simple enough for a family dinner but elegant enough for holidays and special occasions. With its creamy texture, cheesy topping, and deep garlic flavor, it is a side dish that can easily become the star of the table.
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