Sausage and Egg Casserole

This cozy, make-ahead sausage and egg casserole features savory breakfast sausage, sharp cheddar cheese, and a velvety, custard-like egg center that never turns watery.

Why This Recipe Works:

• Starch Gelatinization: The cubed French bread acts as a molecular sponge, trapping moisture and preventing the eggs from weeping.
• Pre-Rendered Sausage: Browning and draining the sausage first removes excess grease, keeping the casserole light and savory rather than oily.
• Gentle Baking Temperature: Baking at 350°F ensures the egg protein matrix sets softly without curdling or puffing up too quickly.

My first attempt at a holiday breakfast bake ended in a literal puddle of yellow water on my plate, right next to a piece of dry, rubbery egg sponge.

I remember scraping the sad, soggy mess into the trash with my favorite wooden spoon, my wrists aching from whisking too hard, wondering how something with so much cheese could taste so incredibly depressing.

The culprit, as I later learned after testing six different egg-to-milk ratios, is a phenomenon called syneresis. When you bake eggs too fast or add too much liquid, the egg proteins tighten up like tiny, angry fists, squeezing out all the water they were supposed to hold. This is why so many overnight bakes turn into a watery swamp under a layer of grease.

The fix is beautifully simple: we need a starch to act as a safety net.

By folding in cubed bread, we create a sponge that traps that moisture, giving you a velvety, custard-like texture every single time.

If you love cozy morning bakes like my Croissant Breakfast Casserole, this savory sausage version is absolutely perfect for feeding a hungry crowd without any morning-of stress.

For busy weekdays, try these Sausage Egg Breakfast Roll-Ups instead.

Sausage and Egg Casserole

• Publisher Storied Skillet
• Cuisine American
• Category Breakfast, Casseroles
• Prep Time 15 minutes
• Cook Time 45 minutes
• Servings 8
• Calories 380 calories
• Rating 4.8 1346
• Tags sausage egg casserole, breakfast bake, overnight breakfast casserole, easy breakfast recipe

Ingredients

• 1 lb (450g) ground pork breakfast sausage
• 8 large eggs
• 2 cups whole milk
• 1 tsp Diamond Crystal kosher salt
• 1/2 tsp freshly cracked black pepper
• 1/2 tsp garlic powder
• 6 cups cubed day-old French bread (1-inch cubes)
• 2 cups shredded sharp cheddar cheese, divided

Directions

1. Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish with butter or non-stick cooking spray.
2. Heat a large skillet over medium-high heat, add the ground sausage, and cook while breaking it up with a wooden spoon until browned and cooked through (about 8 to 10 minutes).
3. Drain the cooked sausage thoroughly on a paper-towel-lined plate to remove excess grease.
4. In a large mixing bowl, vigorously whisk the eggs, whole milk, Diamond Crystal kosher salt, black pepper, and garlic powder until completely smooth and slightly frothy.
5. Spread the cubed French bread evenly across the bottom of the prepared baking dish.
6. Scatter the drained sausage and 1.5 cups of the cheddar cheese evenly over the bread cubes.
7. Pour the egg mixture evenly over the bread and sausage, pressing down gently with a spatula so the bread begins to absorb the liquid.
8. Bake uncovered for 40 to 45 minutes, sprinkling the remaining 1/2 cup of cheddar cheese on top during the last 10 minutes of baking, until the center is set and the top is golden brown. Let rest for 10 minutes before slicing.

Notes

• Salt Conversions: I highly recommend Diamond Crystal kosher salt; if you are using Morton's kosher salt or fine table salt, cut the volume in half (use 1/2 teaspoon instead of 1 teaspoon) to avoid an overly salty bake.
• The Science of Milk Fat: Whole milk is crucial here because its fat content coats the egg proteins, preventing them from bonding too tightly and squeezing out water during baking.
• Workflow Warning: Keep a close eye on the cheese during the final 10 minutes of baking; if your oven runs hot, tent the dish loosely with foil to prevent the cheese from scorching before the egg center sets.
• Storage Behavior: After a day in the fridge, the bread will continue to hydrate, making the leftovers slightly denser but incredibly moist when reheated.
• Starch Swaps: If you prefer a different starch base, you can easily swap the bread for frozen shredded hash browns, similar to the technique used in our Breakfast Pizza with Hash Brown Crust.

Serving Suggestions

This hearty casserole is a complete meal on its own, but pairing it with bright, fresh sides helps balance the rich sausage and cheese.

• A simple green salad tossed with a light lemon vinaigrette.
• Fresh seasonal fruit salad featuring berries, melon, and mint.
• Warm, flaky Blueberry Biscuits served with honey butter.
• A splash of your favorite hot sauce or a spoonful of fresh salsa on top.
• A side of crispy bacon if you are feeding a crowd of dedicated meat lovers.
• A hot cup of pour-over coffee or a refreshing glass of freshly squeezed orange juice.

Storage and Reheating

Leftovers are actually a gift.

Store any remaining casserole in an airtight container in the refrigerator for up to four days. The structure holds up beautifully, though the cheese top will lose its initial oven-crispness.

For the absolute best results, I highly recommend reheating slices in a 350°F (175°C) oven or toaster oven for about 12 to 15 minutes. This gentle, dry heat revives the melted cheese on top and warms the center without overcooking the delicate egg proteins, which would otherwise weep moisture.

In a pinch, the microwave works too.

Just drape a damp paper towel over the plate to trap steam and keep the eggs from turning into rubber.

For long-term storage, wrap individual slices tightly in plastic wrap and freeze them for up to two months, thawing in the fridge before reheating.

Ingredient Substitutes

If you need to adapt this recipe to what you have in your pantry, here are the easiest swaps:

1. Sausage: Swap the pork sausage for ground turkey sausage, chicken sausage, or even a vegetarian sausage alternative. If you want a different flavor profile, try using chopped ham or bacon.
2. Bread: Day-old French bread is best, but sourdough, brioche, or even leftover croissants work wonderfully. If you want a gluten-free option, use your favorite gluten-free bread or swap it for frozen hash browns.
3. Cheese: Sharp cheddar provides a great bite, but Gruyère, Swiss, Monterey Jack, or pepper jack will completely transform the flavor profile.
4. Milk: If you don't have whole milk, you can use a mix of half-and-half and skim milk. Avoid using non-dairy milks unless they are unsweetened and unflavored, as any sweetness will clash with the savory sausage.

I hope this cozy bake brings as much warmth to your kitchen table as it does to mine. Pour yourself a hot cup of coffee, pull up a chair, and enjoy a slow, beautiful morning.