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Sausage, Egg, and Hash Brown Breakfast Casserole

A precrisped potato base, moisture-conscious filling, and gently baked custard turn familiar breakfast staples into a dependable brunch centerpiece.

Golden breakfast casserole with crisp hash brown edges, sausage, red pepper, cheddar, and scallions sits beside one plated portion.

Breakfast casserole often asks crisp potatoes and tender eggs to share one dish, even though they thrive under opposite conditions. This method gives the potatoes an early blast of high heat, cooks excess moisture from the filling, and bakes the assembled custard only until safely set.

Dry potatoes make crisp edges

Thawed hash browns can carry enough water to steam the entire base, so squeeze until the towel yields no more drips. A hot buttered dish and a short pre-bake then establish browned edges before the wet custard ever arrives.

Cook away hidden moisture

Browned sausage contributes flavor and fat, while onion and bell pepper need extra skillet time to release their water. Wait until visible steam subsides and the pan looks dry before layering the filling over the potatoes.

Precrisped shredded hash browns form a lightly golden, dry base in a buttered rectangular baking dish. — Lightly browned hash browns line the hot baking dish before the sausage, vegetables, cheese, and custard are added.

Gentle mixing, gentle baking

Whisk the custard only until no streaks remain, since excess air makes eggs puff dramatically and then turn spongy. At the end of baking, trust 160 F and a slight center wobble rather than waiting for a rigid surface.

Choose the morning schedule

Bake-now keeps the potato base at its crispest and reaches the table fastest. The overnight route trades a little of that immediate crunch for an easier morning; tempering the cold dish for 20 minutes promotes more even baking.

A cut casserole portion reveals crisp shredded potato edges, tender egg, browned sausage, red pepper, cheddar, and scallions. — A cut corner reveals crisp potato edges, moist egg custard, browned sausage, peppers, and melted cheddar.

Reheat for a crowd

A 10-minute rest lets clean portions emerge without driving the eggs past tenderness. For later arrivals, cover individual portions and reheat gently at 325 F until 165 F in the center, preserving moisture while meeting a safe serving temperature.

Sausage, Egg, and Hash Brown Breakfast Casserole

8 servings

80 minutes total

Ingredients

• 1 1/2 lb frozen shredded hash browns, thawed
• 2 tbsp extra-virgin olive oil, divided
• 1 tbsp unsalted butter, softened
• 1 lb pork breakfast sausage
• 1 medium yellow onion, diced
• 1 medium red bell pepper, diced
• 10 large eggs
• 1 1/2 cups half-and-half
• 1 1/2 tsp kosher salt, divided
• 1 tsp freshly ground black pepper
• 1/2 tsp garlic powder
• 8 oz sharp cheddar cheese, shredded
• 4 scallions, thinly sliced

Method

Heat the oven and pan
Heat the oven to 425 F, rub a 9-by-13-inch baking dish with the softened butter, and place the empty dish in the oven for 5 minutes.
Look for: The oven is fully heated and the buttered dish is hot to the touch at its rim.
Dry the potatoes
Wrap the thawed hash browns in a clean towel and squeeze firmly over the sink until no more liquid drips, then toss them with 1 tbsp olive oil and 1/2 tsp salt.
Look for: The potato shreds feel dry and separate rather than wet or clumped.
Precrisp the hash browns
Press the potatoes across the bottom and slightly up the sides of the hot dish, drizzle with the remaining 1 tbsp olive oil, and bake for 15 minutes.
Look for: The potato edges are lightly browned and the surface looks dry.
Brown the sausage
While the potatoes bake, cook the breakfast sausage in a large skillet over medium-high heat for 6 minutes, breaking it into small crumbles as it browns.
Look for: The sausage has browned spots and no pink remains.
Cook the vegetables
Add the onion and red bell pepper to the sausage and cook for 5 minutes, stirring often, until softened and the skillet is free of pooled moisture.
Look for: The vegetables are tender and steam no longer billows from the skillet.
Whisk the custard
Whisk the eggs, half-and-half, remaining 1 tsp salt, black pepper, and garlic powder just until fully blended without beating in excessive foam.
Look for: The custard is uniform with few bubbles across the surface.
Layer the casserole
Lower the oven to 350 F, spread the sausage mixture over the potato crust, then add 6 oz cheddar and half the sliced scallions before pouring the custard evenly over everything.
Look for: The fillings form even layers and the custard reaches every corner without overflowing.
Bake now or chill
For bake-now, top with the remaining 2 oz cheddar and bake immediately; for overnight, cover the assembled casserole, refrigerate for 8 to 12 hours, then uncover, add the remaining cheddar, and let the dish stand 20 minutes while the oven heats to 350 F.
Look for: The bake-now casserole is ready for the oven, or the chilled dish has lost its refrigerator chill at the edges.
Bake until just set
Bake uncovered at 350 F for 25 to 30 minutes when assembled warm or 35 to 40 minutes when chilled, until the center reaches 160 F and jiggles only slightly.
Look for: The center registers 160 F, shows no liquid egg, and retains a gentle wobble rather than puffing hard.
Rest and serve
Rest the casserole for 10 minutes, scatter with the remaining scallions, and cut into 8 portions; for reheating, cover portions and warm at 325 F until their centers reach 165 F.
Look for: The slices hold together, the egg remains moist, and reheated portions register 165 F.