Corned Beef Hash and Egg Bake: Hearty One-Dish Breakfast Step-by-step instructions

Before you start

Before starting, make sure the potatoes and corned beef are already cooked. If using raw potatoes, dice them small and simmer in salted water for 8 to 10 minutes, then drain well. For the corned beef, remove any excess fat and dice into 1/2-inch cubes.

Shred the Swiss cheese if not already shredded. Preheat the oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish. Have all ingredients measured and within reach, as the assembly goes quickly.

Instructions

Assemble the Hash Base

1. 1Prepare the base
   Heat the oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish. Spread the diced cooked potatoes and corned beef evenly in the dish, making sure the cubes are in a single layer so they crisp up during baking.
   Look for The potatoes and corned beef should be evenly distributed, with no large gaps.
   Tip If using raw potatoes, dice them small and par-cook before assembling.
2. 2Whisk the egg mixture
   In a large bowl, crack the eggs and add the milk, salt, and pepper. Whisk until the yolks are completely broken and the mixture is uniform and slightly frothy.
   Look for The egg mixture should be a single pale-yellow liquid with no streaks of yolk.
   Tip Whisking thoroughly ensures a tender, evenly set custard.
3. 3Pour over the hash
   Pour the egg mixture evenly over the potatoes and corned beef. Tilt the dish slightly or use a spatula to nudge the cubes so the eggs settle around them.
   Look for The liquid should mostly cover the solids, leaving a few potato tops exposed.
   Tip Don't stir after pouring—just gently press down any dry spots.

The baking dish is filled with an even layer of potatoes and corned beef, with the egg mixture poured over and the cheese scattered on top.

The dish looks colorful and inviting, with the yellow custard peeking through the cheese. Before baking, ensure the egg mixture has settled into all the gaps—use a spatula to nudge any dry spots.

Bake to Golden Perfection

4. 4Top with Swiss cheese
   Sprinkle the shredded Swiss cheese evenly over the top, covering the entire surface. Use your fingers to scatter it so it melts into a golden, bubbly crust.
   Look for A thick, even layer of cheese covers the egg mixture.
   Tip Shredding your own cheese from a block melts more smoothly than pre-shredded.
5. 5Bake until set and golden
   Place the dish in the oven and bake for 30 to 35 minutes, until the edges are bubbling and the center is just set—no longer jiggly. The top should be puffed and deeply golden in spots.
   Look for The center springs back when lightly pressed, and a knife inserted comes out clean.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If the top browns too quickly, tent loosely with foil for the last 10 minutes.
6. 6Rest before serving
   Remove the bake from the oven and let it rest for 5 minutes. This allows the eggs to finish setting and makes cutting neat squares easier.
   Look for The dish is slightly firmer and no longer steaming aggressively.
   Tip Resting is key for clean slices—don't skip it.

After 30-35 minutes, the bake is puffed, golden, and bubbling at the edges. The aroma of melted cheese and corned beef fills the kitchen. The center is set and no longer jiggly, and a knife inserted comes out clean. The top is deeply browned in spots, and the edges have a crispy, cheesy crust.

Rest and Serve

7. 7Slice and serve
   Use a spatula to lift out neat squares, making sure to get the crispy edges and the cheesy top. Serve warm, straight from the dish.
   Look for Each square holds together with visible layers of potato, corned beef, and egg.
   Tip Pair with a simple green salad or fresh fruit for a complete meal.

After a 5-minute rest, the bake has settled and is easier to slice. The squares lift cleanly with a spatula, showing distinct layers of potato, corned beef, and egg, all bound together by melted Swiss cheese. The texture is tender and moist, with a satisfying contrast between the crispy edges and the soft interior.

Common mistakes

A common mistake is underbaking, which leaves the center runny. To avoid this, bake until the center is fully set and a knife comes out clean—if the top browns too quickly, cover with foil.

Overbaking is another issue, resulting in a rubbery texture; check at the 30-minute mark. Also, avoid overmixing the egg mixture, as too much air can cause puffing and sinking. Finally, don't skip the resting time, as cutting too soon will cause the bake to fall apart.

How to tell it’s done

The bake is done when the edges are bubbling and the center is just set—it should not jiggle when gently shaken. A knife inserted into the center should come out clean, and the internal temperature of the eggs should reach 160°F (71°C).

The top will be puffed and golden with spots of browned cheese. Let it rest for 5 minutes before slicing; this allows the eggs to finish setting and makes for cleaner pieces.

• Egg dishes: 160°F (71°C) in the thickest part