Step 1: Prepare the Potatoes
- Preheat your oven to 375°F (190°C).
- Wash and thinly slice the potatoes (about ⅛-inch thick).
- Slice the onion into thin rings.
Step 2: Assemble the Casserole
- Lightly grease a 9×13-inch baking dish.
- Arrange half of the potato slices on the bottom.
- Add half of the sliced onions.
- Spread half of the corned beef over the onions.
- Repeat with the remaining potatoes, onions, and corned beef.
Step 3: Season
- Brush the top with melted butter.
- Sprinkle with garlic powder, black pepper, and paprika if using.
Step 4: Bake
- Cover tightly with aluminum foil.
- Bake for 45 minutes.
- Remove the foil and continue baking for 20-30 minutes, until the potatoes are fork-tender and the top is beautifully browned.
Step 5: Serve
- Let the casserole rest for 10 minutes before serving.
- Enjoy with buttered bread, pickles, or a fresh green salad.
Tips
- Slice the potatoes evenly so they cook at the same rate.
- For extra richness, add a few tablespoons of butter between the layers.
- Want a cheesy version? Sprinkle 1 cup of shredded cheddar over the top during the last 10 minutes of baking.
- Leftovers taste even better the next day and reheat wonderfully.
Prep Time
15 minutes
Cook Time
1 hour 10 minutes
Total Time
1 hour 25 minutes
Servings
6
This humble casserole proves that simple ingredients can create a comforting, filling meal that’s packed with nostalgic flavor—just like Grandma used to make.
