Loaded Scalloped Potatoes layer 3 pounds of thin potato rounds with deeply caramelized onions, crisp bacon, mixed sharp cheddar and Gruyere, and a smooth milk-based cream sauce. The 9×13-inch casserole serves 10. It takes 110 minutes—20 minutes of preparation and 90 minutes of baking—plus a 10-minute rest that lets the sauce thicken around the tender potato layers.
This guide preserves every recorded ingredient, quantity, temperature, time, and method step. Read the full sequence once before beginning.
Loaded Scalloped Potatoes Ingredients
Base Ingredients: 3 lbs potatoes, thinly sliced (Yukon Gold or russet); 2 medium onions, thinly sliced; 12 oz bacon; 8 oz cheese (combination of sharp cheddar and Gruyere recommended); Salt and freshly ground black pepper.
For the Cream Sauce: 2 tbsp extra virgin olive oil; 4 tbsp unsalted butter; 4 tbsp all-purpose flour; 3 cups whole milk.
If you enjoy this recipe, you may also like Cheesy Scalloped Potatoes.
Plan the Work Before Cooking
Measure every ingredient and prepare these tools: 9x13 baking dish (or deep 9x9); Mandoline or sharp knife for slicing potatoes; Medium skillet; Whisk; Box grater for cheese; Measuring cups and spoons. Arrange each recipe group in method order. Keep raw meat and its utensils away from cooked food, and reserve a clean plate for anything that returns to the pan. This setup protects short timing windows and lets you watch browning, bubbling, thickening, or melting instead of searching for an item. Keep the exact source quantities; their ratios determine seasoning, structure, and yield.
For storage details after serving, the USDA leftovers and food safety guidance.
How to Make Loaded Scalloped Potatoes
- Prepare your equipment: Preheat oven to 350°F. Lightly grease a 9x13 baking dish with butter and set aside. If you have a mandoline, use it to slice the potatoes evenly to about 1/8-inch thickness.
- Caramelize the onions: Heat olive oil in a medium skillet over medium heat. Add the thinly sliced onions with a pinch of salt and pepper. Cook, stirring occasionally, for about 20 minutes until the onions develop a deep caramel color. Remove from the pan and set aside.
- Cook the bacon: While the onions caramelize, cook the bacon until crispy either in a separate pan or in the oven on a baking sheet at 400°F for about 15-20 minutes. Once cooked, let it cool slightly, then crumble into pieces.
- Make the cream sauce: In a clean saucepan, melt the butter over medium heat. Sprinkle flour over the melted butter and whisk continuously to form a roux. Cook for 2 minutes to remove the raw flour taste. Slowly pour in the milk while whisking constantly to prevent lumps. Bring the mixture to a gentle simmer and cook for 2-3 minutes until it thickens slightly. Season with salt and pepper.
- Layer the ingredients: Create the first layer by arranging half of the sliced potatoes in the prepared baking dish. Top with half of the caramelized onions, half of the crumbled bacon, half of the shredded cheese, and half of the cream sauce. Repeat the layers with the remaining ingredients, finishing with cheese on top.
- Bake to perfection: Cover the dish tightly with aluminum foil and bake for 1 hour. Then remove the foil and continue baking for an additional 30 minutes until the top is golden brown and bubbly, and the potatoes are tender when pierced with a fork.
- Rest before serving: Remove from the oven and let the dish rest for 10 minutes before serving. This allows the sauce to thicken slightly and makes serving easier.
If you enjoy this recipe, you may also like Brisket Loaded Twice Baked Potatoes.
Why the Order Matters
Uniform ⅛-inch potato slices cook at the same rate, which is why a mandoline is useful. Twenty minutes of slow onion cooking develops sweetness before layering. Bacon is cooked separately until crisp so it keeps texture in the sauce. A butter-and-flour roux cooks for 2 minutes before milk is added gradually, preventing raw flour flavor and lumps. Dividing potatoes, onions, bacon, cheese, and sauce into two complete layers distributes every component from the center to the corners.
Critical Visual and Timing Cues
Caramelized onions should be deeply golden rather than merely translucent. The cream sauce needs a gentle 2–3 minute simmer after the milk is whisked in; it should thicken slightly but remain pourable. Cover the completed dish tightly with foil and bake at 350°F for 1 full hour. Remove foil and continue another 30 minutes. The casserole is ready only when the top is golden and bubbling and a fork slides through the potato layers without resistance. Do not skip the final 10-minute rest.
Serving and Storage
Spoon portions after the rested sauce has settled. Yukon Gold or russet potatoes are both recorded options; keep the total at 3 pounds. The recommended 8-ounce cheese combination is sharp cheddar and Gruyere, providing both bold flavor and smooth melting. Season onions and sauce with salt and freshly ground pepper as directed rather than seasoning only the surface. Cool leftovers promptly and reheat covered until hot, uncovering briefly at the end if the cheese top needs refreshing.
Recorded Recipe Tips
- This recipe can be easily doubled for larger gatherings or holiday meals.
- For best results, use a mandoline to get uniformly thin potato slices that will cook evenly.
- You can customize the cheese blend - sharp cheddar and Gruyere offer excellent flavor, but fontina, Gouda or Monterey Jack work well too.
- Leftovers reheat beautifully and can be stored in the refrigerator for up to 3 days.
Food Safety and Allergen Note
The recorded allergen information is: Contains dairy (butter, milk, cheese); Contains gluten (flour). Check packaged ingredients when cooking for someone with an allergy because brands and facilities vary. Refrigerate perishables promptly, prevent cross-contamination, and use every explicit doneness test in the source method. These precautions support the recipe without changing its quantities, temperatures, timing, or sequence.
Conclusion
Loaded Scalloped Potatoes makes 10 servings in 110 minutes of recorded preparation and cooking, plus any separately stated rest. Follow the exact ingredient list and ordered method for the intended texture and doneness.
Frequently Asked Questions
- → How many servings does Loaded Scalloped Potatoes make?
It serves 10 and makes 10 servings.
- → How long does Loaded Scalloped Potatoes take?
The recipe records 20 minutes of preparation, 90 minutes of cooking, and 110 minutes total, plus any separately stated rest.
- → What equipment should be ready?
Prepare 9x13 baking dish (or deep 9x9); Mandoline or sharp knife for slicing potatoes; Medium skillet; Whisk; Box grater for cheese; Measuring cups and spoons before starting.
- → Can I change the recorded method?
For the verified result, keep the listed quantities, temperatures, timing, and ordered instructions exactly as written. Use only optional variations explicitly recorded in the recipe tips.