Meta Information
Prep Time: 15 minutes
Cook Time: 1 hour 10 minutes
Total Time: 1 hour 25 minutes
Servings: 6-8 servings
Cuisine: American Comfort Food
Difficulty: Easy
Introduction
Cheesy Onion Scalloped Potatoes are the ultimate comfort food side dish. Thinly sliced potatoes are layered with a rich onion-infused cream sauce and topped with plenty of melty cheese before being baked until tender, creamy, and golden brown.
This simple 4-ingredient recipe delivers incredible flavor with minimal effort. The onion soup mix adds savory depth, the cream creates a luscious sauce, and the cheese forms a bubbly golden crust that makes every bite irresistible. Whether you’re serving it for a holiday meal, Sunday dinner, potluck, or weeknight family dinner, this casserole is always a crowd favorite.
Why You’ll Love This Recipe
- Only 4 simple ingredients
- Rich, creamy, and cheesy
- Easy to prepare
- Perfect holiday side dish
- Great for potlucks
- Family-friendly recipe
- Budget-friendly ingredients
- Make-ahead friendly
Look at the Recipe
This cheesy potato casserole features:
- Tender sliced potatoes
- Savory onion cream sauce
- Golden melted cheese
- Rich, creamy texture
- Crispy browned top
- Incredible comfort-food flavor
The combination creates a dish that’s creamy in the center with a beautifully golden, bubbly top layer.
Ingredients Needed
Main Ingredients
- 2 pounds russet or Yukon Gold potatoes, thinly sliced
- 1 packet onion soup mix
- 1 cup heavy cream
- 1½ cups shredded mozzarella or Swiss cheese
Ingredient Notes
Potatoes
Russet potatoes create a softer, creamier casserole, while Yukon Gold potatoes hold their shape slightly better and provide a buttery flavor.
Onion Soup Mix
The secret ingredient that delivers deep savory onion flavor without extra prep work.
Heavy Cream
Creates a rich, luxurious sauce that coats every slice of potato.
Cheese
Mozzarella provides excellent meltability, while Swiss cheese adds a deeper, nuttier flavor.
Kitchen Tools You’ll Need
- Medium baking dish
- Sharp knife or mandoline slicer
- Mixing bowl
- Measuring cups
- Aluminum foil
- Cutting board
Step-by-Step Instructions
Step 1: Preheat the Oven
Preheat oven to 375°F (190°C).
Grease a medium-sized baking dish.
Step 2: Slice the Potatoes
Wash and peel potatoes if desired.
Slice them into thin, even rounds.
Keeping the slices uniform helps ensure even cooking.
Step 3: Layer the Potatoes
Arrange the potato slices evenly in the prepared baking dish.
You can slightly overlap the slices for a more traditional scalloped potato appearance.
Step 4: Prepare the Cream Mixture
In a bowl, whisk together:
- Heavy cream
- Onion soup mix
Mix until fully combined.
Step 5: Add the Sauce
Pour the cream mixture evenly over the potatoes.
Try to coat as many potato slices as possible.
Step 6: Add the Cheese
Sprinkle the shredded cheese evenly over the top.
Cover the entire surface for maximum cheesiness.
Step 7: Bake Covered
Cover tightly with aluminum foil.
Bake for 45 minutes.
Step 8: Bake Uncovered
Remove the foil.
Continue baking for 20-25 minutes until:
- Potatoes are fork-tender
- Cheese is melted
- Top is golden brown
- Edges are bubbling
Step 9: Rest Before Serving
Allow the casserole to rest for 5-10 minutes.
This helps the creamy sauce thicken and settle.
Tips for Best Results
Slice Potatoes Evenly
Consistent thickness ensures all potatoes cook at the same rate.
Use Freshly Grated Cheese
Freshly shredded cheese melts more smoothly and creates a better texture.
Cover Tightly
This helps steam the potatoes until perfectly tender.
Let It Rest
Resting allows the sauce to thicken and improves serving texture.
Use a Mandoline
A mandoline slicer makes creating uniform potato slices quick and easy.
Variations and Substitutions
Extra Cheesy Version
Add:
- Cheddar cheese
- Monterey Jack
- Gruyère
Bacon Version
Add:
- Crispy crumbled bacon between layers
Garlic Version
Mix in:
- 2 teaspoons minced garlic
Herb Version
Add:
- Fresh thyme
- Rosemary
- Parsley
Ham and Potato Bake
Layer diced ham between potato slices.
Mushroom Version
Add sautéed mushrooms for extra flavor.
What to Serve with Scalloped Potatoes
This casserole pairs perfectly with:
- Roast chicken
- Meatloaf
- Pork chops
- Steak
- Ham
- Roast turkey
- Grilled sausage
- Green beans
Storage Instructions
Refrigerator
Store leftovers in an airtight container for up to 4 days.
Reheating
Reheat in:
- Oven at 350°F for 15-20 minutes
- Microwave in 30-second intervals
Freezing Instructions
Allow the casserole to cool completely.
Wrap tightly and freeze for up to 2 months.
Thaw overnight before reheating.
Make Ahead Instructions
Assemble the casserole up to 24 hours in advance.
Cover and refrigerate.
Bake when ready to serve.
You may need to add 5-10 minutes to the baking time if starting from cold.
Common Mistakes to Avoid
Slicing Potatoes Too Thick
Thick slices can remain undercooked.
Using Low-Fat Cream
Heavy cream provides the best texture and richness.
Skipping the Foil
The covered baking stage is essential for tender potatoes.
Not Resting Before Serving
The sauce needs time to set properly.
Using Pre-Shredded Cheese
Pre-shredded cheese often doesn’t melt as smoothly.
Frequently Asked Questions
Can I use Yukon Gold potatoes instead of russets?
Yes. Yukon Gold potatoes work wonderfully and provide a naturally buttery flavor.
Do I need to peel the potatoes?
No. The skins can be left on if preferred, especially with Yukon Gold potatoes.
Can I make this ahead of time?
Absolutely. Assemble it the day before and bake when ready.
What cheese works best?
Swiss, mozzarella, Gruyère, cheddar, and Monterey Jack are all excellent choices.
Can I add meat?
Yes. Ham, bacon, sausage, or shredded chicken work very well.
Why are my potatoes still firm?
They were likely sliced too thick or needed additional baking time.
Can I use half-and-half instead of heavy cream?
Yes, but the sauce may be slightly thinner and less rich.
How do I know when it’s done?
A fork should slide easily through the potatoes and the cheese should be golden and bubbly.
Nutrition Information
Per Serving (Approximate)
- Calories: 340
- Protein: 10g
- Carbohydrates: 28g
- Fat: 22g
- Fiber: 3g
- Sugar: 2g
Nutrition values may vary based on ingredients used.
Final Thoughts
Cheesy Onion Scalloped Potatoes are a classic comfort-food casserole that’s simple to prepare yet impressive enough for special occasions. The combination of tender potatoes, creamy onion sauce, and melted golden cheese creates a side dish that everyone reaches for first. Whether you’re serving it alongside holiday ham, roast chicken, or a weeknight family dinner, this easy potato bake is guaranteed to become a favorite recipe in your collection.
