Corned Beef Hash and Egg Bake: Hearty One-Dish Breakfast

This corned beef hash and egg bake is the kind of breakfast that feels like a weekend treat but comes together in minutes. Diced potatoes and salty corned beef get baked in a simple egg custard, then topped with a thick layer of Swiss cheese that turns golden and bubbly.

It's hearty, satisfying, and perfect for feeding a crowd with minimal fuss. Serve it straight from the baking dish for a rustic, comforting start to the day.

Breakfast casseroles are a lifesaver when you want something warm and filling without standing over a skillet. This version uses leftover corned beef and cooked potatoes, so it's a great way to repurpose holiday leftovers or make-ahead components.

The eggs are beaten with a splash of milk, poured over the hash, and baked until puffed and set. Swiss cheese adds a nutty, melty finish that ties everything together. The result is a tender, savory bake that slices into neat squares and tastes even better than the sum of its parts.

Ingredients

Why this recipe works

The method here is simple but effective: layering the potatoes and corned beef in the dish first means they get slightly crispy on the bottom while the eggs bake around them.

The custard stays soft and moist because the potatoes release some starch, which helps stabilize the eggs. The milk adds richness without making the bake heavy, and the Swiss cheese forms a protective top that browns beautifully.

Baking instead of pan-frying allows the eggs to set gently and evenly, giving you a sliceable casserole rather than a scramble. The rest time after baking is crucial—it lets the custard finish setting, so each square holds its shape when lifted. This is a forgiving recipe that welcomes substitutions, making it a reliable go-to for brunch or a weeknight dinner.

Notes and substitutions

The quality of the corned beef matters. Look for a well-trimmed, cooked corned beef brisket from the deli or leftover from a boiled dinner. If using canned corned beef, drain it well and flake it into chunks.

For the potatoes, any cooked variety works—Yukon Gold or red potatoes hold their shape best. You can use leftover roasted or boiled potatoes, or quickly par-cook raw diced potatoes in the microwave before assembling.

Swiss cheese is classic here, but Gruyère or sharp cheddar are excellent swaps. Pre-shredded cheese often contains anti-caking agents that can affect melting, so shredding your own from a block is worth the extra minute. The baking dish should be at least 9x13 inches so the eggs set without overflowing. A glass or ceramic dish works well; metal conducts heat faster, so adjust baking time accordingly.

• Swiss cheese: Use Gruyère, cheddar, or Monterey Jack for a different flavor.
• Whole milk: Any milk or half-and-half works; for a richer custard, use heavy cream.
• Cooked corned beef: Leftover roast beef or ham can be swapped in.
• Diced cooked potatoes: Use frozen shredded hash browns (thawed) for a different texture.

Equipment

• 9x13-inch baking dish
• Large mixing bowl
• Whisk
• Measuring cups and spoons
• Aluminum foil (optional)