3-Ingredient Potato Casserole with Onions
If you love easy old-fashioned recipes, this 3-ingredient potato casserole is one to keep in your recipe box. Thinly sliced potatoes and onions are layered with lard, covered, and baked until wonderfully tender. The final uncovered baking time gives the top deliciously browned and crispy edges.
This easy potato casserole is inexpensive, filling, and perfect when you want a comforting side dish without a long ingredient list. It pairs beautifully with eggs, roasted chicken, ham, sausage, or green vegetables.
Why You’ll Love This Potato Casserole
- Only 3 main ingredients — potatoes, onion, and lard.
- Budget-friendly — ideal for stretching inexpensive pantry staples.
- Easy preparation — simply slice, layer, cover, and bake.
- Old-fashioned comfort food — inspired by simple family-style cooking.
- Tender potatoes with crispy edges — covering the casserole first helps the potatoes soften before browning.
- Great side dish — serve it with breakfast, lunch, or dinner.
- Easy to customize — salt, pepper, garlic powder, or herbs can be added to suit your taste.
Ingredients
- 2 1/2 pounds potatoes, peeled and thinly sliced
- 1 large onion, thinly sliced
- 4 tablespoons lard, softened or melted
Optional: Salt, black pepper, and garlic powder
How to Make 3-Ingredient Potato Casserole
1. Prepare the oven
Preheat your oven to 375°F (190°C). Lightly grease a glass or ceramic baking dish.
2. Layer the potatoes and onions
Arrange about one-third of the sliced potatoes in the bottom of the baking dish. Add some sliced onion and drizzle or dot with part of the lard.
Continue layering the potatoes, onions, and lard until everything has been used.
3. Bake covered
Cover the baking dish tightly with aluminum foil. Bake for about 45 minutes, allowing the potatoes to steam and become tender.
4. Brown the top
Remove the foil and continue baking for another 25–35 minutes, or until the potatoes are completely fork tender and the top is deeply golden with crispy edges.
5. Rest and serve
Allow the casserole to rest for approximately 10 minutes before serving. This helps the layers settle while keeping the browned edges pleasantly crisp.
Tips for the Best Potato Casserole
Slice the potatoes evenly:
Try to keep the potato slices similar in thickness. This helps them cook evenly and prevents some pieces from becoming overcooked while others remain firm.
Choose the right potatoes:
Russet potatoes create a softer, classic baked-potato texture. Yukon Gold potatoes hold their shape better and have a naturally buttery flavor.
Don’t skip the covered baking time:
Keeping the casserole covered at first traps steam and helps the potatoes become fork tender before the surface gets too brown.
Want extra-crispy edges?
Leave the casserole uncovered during the entire final baking period. For an especially browned top, you can broil it briefly at the end, watching carefully to prevent burning.
Add simple seasoning:
The basic recipe is intentionally minimal, but salt and freshly ground black pepper can make a noticeable difference. A small amount of garlic powder can also add extra savory flavor.
Easy Variations
Garlic Onion Potato Casserole
Add a light sprinkle of garlic powder between the layers for additional savory flavor.
Herb Potato Casserole
Add dried thyme, rosemary, or parsley before baking.
Cheesy Potato Casserole
For a richer version, sprinkle shredded cheddar cheese over the casserole during the final 10 minutes of baking.
Crispy Potato and Onion Bake
Use slightly thinner potato slices and give the casserole plenty of uncovered baking time to maximize the golden, crispy edges.
What to Serve With Potato Casserole
This simple potato bake works especially well with:
- Fried or scrambled eggs
- Roasted chicken
- Smoked sausage
- Roast beef
- Green beans
- Cucumber salad
- Applesauce
- Fresh garden salad
For a simple meal, serve a generous portion with a slice of crusty bread.
Recipe Benefits
This recipe is especially useful when you need a simple, inexpensive side dish. Potatoes are filling and versatile, while the short ingredient list makes this casserole convenient for busy weeknight meals. It also works well as a pantry-friendly comfort food when you don’t want to make an elaborate recipe.
Frequently Asked Questions
Can I use butter instead of lard?
Yes. Butter can be used as a substitute if you prefer its flavor or don’t keep lard on hand. The texture and browning may be slightly different.
Which potatoes are best for this casserole?
Russet potatoes are excellent for a soft, tender texture. Yukon Gold potatoes are another good choice if you prefer potatoes that hold their shape.
Can I prepare this casserole ahead of time?
You can slice the potatoes and onions a few hours ahead. Keep the potatoes submerged in cold water to prevent discoloration, then drain and dry them thoroughly before assembling the casserole.
How do I make the top extra crispy?
Bake uncovered during the full final cooking period. If necessary, broil the casserole for 1–2 minutes at the end, watching it closely.
Can I add cheese?
Absolutely. Cheddar, Monterey Jack, or another good melting cheese can be added during the final 10 minutes of baking for a richer casserole.
