Breakfast Casserole with Sausage
AI-generated image
Gluten-free American

Breakfast Casserole with Sausage

A hearty American breakfast bake layered with savory sausage, tender potatoes, spinach, sharp cheddar, and custardy eggs. It is assembled the night before or baked immediately for a golden, satisfying start to the day.

65 min 6 servings Medium
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How to prepare

1
Heat the oven to 190°C. Lightly grease a 23 cm by 33 cm baking dish with a little of the olive oil.
2
Heat the remaining olive oil in a large ovenproof skillet over medium-high heat. Add the sausage and onion, breaking the meat into small pieces, and sauté for 6 to 8 minutes until browned and the onion is translucent. Drain excess fat if needed.
3
Add the potatoes, 2 g of the salt, and half of the pepper to the skillet. Sauté for 8 to 10 minutes, stirring occasionally, until the cubes are lightly browned and nearly tender. Add the spinach and cook for 1 to 2 minutes, just until wilted.
Sausage, browned potatoes, and wilted spinach in a skillet AI-generated image
4
Whisk the eggs, milk, Dijon mustard, remaining salt, and remaining pepper in a bowl until smooth and evenly combined.
5
Transfer the sausage and potato mixture to the prepared baking dish and spread it into an even layer. Sprinkle over half of the cheddar, pour in the egg mixture, then top with the remaining cheddar.
6
Bake for 30 to 35 minutes, rotating once, until the center is set with only a slight jiggle and the top is puffed and golden. The egg mixture should reach 74°C in the center.
Golden sausage breakfast casserole fresh from the oven AI-generated image
7
Rest the casserole for 10 minutes so the custard settles, then cut into six portions and serve warm.

Why this recipe works

Browning the sausage first builds savory depth, while potatoes provide a sturdy base and spinach adds freshness. The eggs bind everything with a tender custard, and cheddar contributes a crisp, salty finish.

Storage and reheating

How to store it

Cool leftovers within 2 hours, cover, and refrigerate for up to 4 days.

How to reheat it

Reheat individual portions in the microwave until steaming hot throughout, or cover and warm in a 175°C oven for 15 to 20 minutes.

Nutrition / serving

571kcal
30.53 gprotein
21.01 gcarbs
39.97 gfat
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Pantryvale editorial kitchen
Recipe prepared for publication with complete ingredients and ordered cooking steps.
Published 15 Aug 2026 · updated 15 Aug 2026