potatoes into something truly special. Layers of thinly sliced potatoes are bathed in a velvety sauce made from sour cream, melted butter, sharp cheddar cheese, and milk, then baked until golden and bubbly. A sprinkle of breadcrumbs adds a delightful crunchy contrast to the creamy interior.
This is the kind of side dish that belongs on every holiday table, potluck spread, and Sunday supper. It pairs beautifully with ham, roasted chicken, meatloaf, or grilled steak. It is comforting, crowd-pleasing, and surprisingly easy to make.
Why You’ll Love This Recipe
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Rich, creamy, and cheesy
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Layers of tender potatoes in a velvety sauce
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Golden, bubbly cheese topping with optional crunchy breadcrumbs
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Perfect for holidays, potlucks, and family dinners
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Make-ahead friendly
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Crowd-pleasing comfort food
Creamy Potato Casserole
Prep Time: 20 minutes | Bake Time: 1 hour 5-10 minutes (45 covered, 15-20 uncovered) | Resting Time: 10 minutes | Total Time:Approximately 1 hour 35 minutes
Yield: 8-10 servings
Ingredients
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4 large russet potatoes, peeled and thinly sliced
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¼ cup (½ stick) unsalted butter, melted
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1 medium onion, finely chopped
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2 cups sour cream (preferably full-fat)
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2 cups sharp cheddar cheese, shredded (divided)
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1 cup whole milk (2% recommended)
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1 teaspoon salt
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½ teaspoon black pepper (freshly cracked preferred)
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1 teaspoon garlic powder
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½ teaspoon paprika (optional)
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½ cup breadcrumbs (optional, for topping)
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Fresh parsley (optional, for garnish)
Instructions
Step 1: Preheat and Prepare the Pan
Preheat your oven to 350°F (175°C). Lightly grease a standard 9×13-inch baking dish with a bit of extra butter or nonstick cooking spray to keep the starchy potatoes from sticking.
Step 2: Make the Creamy Sauce Base
In a large mixing bowl, combine the melted butter and finely chopped onion. Stir in the sour cream, 1½ cups of the shredded cheddar cheese, the milk, salt, pepper, garlic powder, and optional paprika. Whisk vigorously until the mixture is completely smooth, evenly blended, and free of any large cheese or seasoning lumps.
Step 3: Layer the Casserole
Arrange half of the thinly sliced russet potatoes in an even layer across the bottom of the greased baking dish. Pour exactly half of the creamy sour cream mixture uniformly over the potatoes, using a spatula to spread it to the edges so every slice is well coated. Layer the remaining sliced potatoes flat on top, followed by the rest of the creamy sauce, ensuring all the potatoes are completely submerged to promote uniform cooking.
Step 4: Add the Toppings
Sprinkle the remaining ½ cup of shredded cheddar cheese evenly across the top of the casserole. If using breadcrumbs for added texture, scatter them uniformly over the cheese layer.
Step 5: Bake Covered
Cover the baking dish securely with a sheet of aluminum foil, taking care to arch it slightly so it does not directly touch the cheese topping. Place the pan on the center rack of the preheated oven and bake covered for 45 minutes to allow the potatoes to steam and soften in the rich cream base.
Step 6: Bake Uncovered and Finish
Carefully remove the aluminum foil from the dish and return the casserole to the oven uncovered. Bake for an additional 15 to 20 minutes until the cheese topping is bubbling vigorously and has transformed into a gorgeous, golden-brown crust.
Step 7: Rest and Serve
Remove the dish from the oven and let the casserole rest undisturbed on a heat-safe surface for 10 minutes to allow the rich starches to settle and set up beautifully. Garnish with a sprinkle of chopped fresh parsley and serve warm.
Recipe Notes & Pro Tips
Russet Potatoes are Best: Russet potatoes (also called Idaho potatoes) have a high starch content that becomes fluffy and tender when baked. They are ideal for this casserole. Yukon Gold potatoes can be used but will have a waxy, firmer texture.
Slice the Potatoes Thinly and Evenly: Thin, uniform slices (about ⅛ inch thick) ensure the potatoes cook through in the allotted time. A mandoline slicer makes this quick and precise. Thicker slices will require longer baking time.
Do Not Skip the Foil Cover: Baking covered for the first 45 minutes traps steam, allowing the potatoes to cook through and become tender. Removing the foil for the final 15-20 minutes allows the cheese to brown and the top to become bubbly and golden.
Full-Fat Sour Cream is Best: Full-fat sour cream provides the richest, creamiest texture. Low-fat or non-fat sour cream may result in a thinner sauce and may separate during baking.
Sharp Cheddar Provides the Best Flavor:Sharp or extra-sharp cheddar has a bold, tangy flavor that stands up to the creamy sauce. Mild cheddar will result in a less flavorful casserole.
Make Ahead: You can assemble the casserole (through Step 3) up to 24 hours in advance. Cover and refrigerate. When ready to bake, add 10-15 minutes to the covered baking time since you are starting from cold.
Add Bacon (Optional): Cook 6 slices of bacon until crisp, then crumble. Sprinkle the bacon over the top along with the cheese and breadcrumbs. The smoky, salty bacon adds another dimension of flavor.
Variations
Ham and Potato Casserole: Add 1½ cups of diced cooked ham to the layers along with the potatoes. The ham adds protein and makes this a complete one-dish meal.
Broccoli Potato Casserole: Add 2 cups of steamed broccoli florets between the potato layers. The broccoli adds color, texture, and nutrition.
Bacon Cheddar Potato Casserole: Cook 8 slices of bacon until crisp, then crumble. Sprinkle the bacon over the top along with the cheese and breadcrumbs. The smoky, salty bacon adds another dimension of flavor.
Garlic Herb Potato Casserole: Add 1 tablespoon of fresh chopped rosemary or thyme to the sauce mixture. Add 4 cloves of fresh minced garlic along with the onion.
Creamy Potato and Onion Casserole: Add 1 additional large onion, thinly sliced, between the potato layers. The extra onion becomes sweet and soft during baking.
Parmesan Potato Casserole: Substitute ½ cup of the cheddar with grated Parmesan cheese. Sprinkle the Parmesan over the top during the last 5 minutes of baking for a nutty, crispy crust.
Serving Suggestions
This creamy potato casserole pairs beautifully with:
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Baked ham or roasted turkey
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Grilled steak or pork chops
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Roasted chicken or meatloaf
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Baked fish or salmon
For a complete meal, add:
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Steamed green beans or broccoli
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Roasted asparagus or Brussels sprouts
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A simple green salad with a tangy vinaigrette
Storage & Reheating
Store leftovers in an airtight container in the refrigerator for up to 5 days.
To reheat, place individual portions in the microwave in 60-second bursts, or warm the entire casserole in a 350°F oven for 15-20 minutes, covered with foil to prevent the top from drying out. Add a splash of milk if the casserole seems dry.
This casserole freezes well for up to 3 months. Cool completely, then transfer to freezer-safe containers. Thaw overnight in the refrigerator before reheating.
Why This Recipe Works
This Creamy Potato Casserole is a masterclass in simple, satisfying cooking. The combination of sour cream, melted butter, milk, and sharp cheddar creates a velvety, tangy sauce that coats every slice of potato. The onions soften and sweeten during baking, adding depth and flavor.
Layering the potatoes and sauce ensures that every bite is infused with creamy, cheesy goodness. Baking covered for the first 45 minutes traps steam, allowing the potatoes to cook through and become tender. Removing the foil for the final 15-20 minutes allows the cheese to brown and the top to become bubbly and golden.
This recipe is proof that you do not need a long list of ingredients or complicated techniques to make a memorable side dish. With simple ingredients and a little patience, you can create a potato casserole that is creamy, cheesy, and deeply satisfying. Perfect for holidays, potlucks, or any night you need a warm, comforting side dish.