Name: Overnight Sausage Egg Bake Recipe
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 10 to 12 ounces sausage (casing removed); 2 cloves garlic (minced); 3 cups fresh spinach; 2 large bell peppers (diced); ½ medium yellow onion (diced); 12 large eggs; ½ cup milk (any); ½ cup shredded cheese (any flavor; divided); Olive oil (for sautéing); Salt and pepper (to taste)

There’s nothing quite like waking up to a hearty, flavorful dish that's ready to go straight from the fridge to the oven. This Overnight Sausage Egg Bake Recipe is exactly that kind of magic—simple to prep the night before, full of savory goodness, and perfect for a cozy breakfast or brunch with friends.

The image shows a close-up of a rectangular baked dish divided into square pieces with one piece being lifted by a silver spatula. The dish has about four visible layers: the bottom layer is light and slightly crusty, the second layer is a mix of red and green bits suggesting chopped peppers and spinach, the third layer is creamy white, likely cheese or eggs, and the top layer is a golden orange melted cheese with browned spots and scattered dark green leafy bits. The baking dish is transparent glass placed on a white marbled surface. photo taken with an iphone --ar 2:3 --v 7

Jump to:

Why You'll Love This Recipe
Ingredients & Why They Work
Make It Your Way
Step-by-Step: How I Make Overnight Sausage Egg Bake Recipe
Top Tip
How to Serve Overnight Sausage Egg Bake Recipe
Make Ahead and Storage
Frequently Asked Questions:
Final Thoughts
Overnight Sausage Egg Bake Recipe

Why You'll Love This Recipe

Honestly, this is one of my favorite basement breakfast dishes to make when I have a busy morning ahead or guests to feed. It’s comforting, reliable, and tastes way more gourmet than the effort you put in. Once you try this Overnight Sausage Egg Bake Recipe, I promise it’ll become a staple in your routine.

Make-ahead convenience: Prepare it the night before, so your oven does the work while you snooze.
Balanced flavors and textures: Juicy sausage blends perfectly with tender sautéed veggies and fluffy eggs.
Customizable to your taste: You can switch up cheeses, veggies, or sausage types for endless variations.
Feeds a crowd easily: One casserole serves a family or a small gathering without fuss.

This image shows a white speckled plate holding a square piece of egg casserole with three visible layers: the top layer is golden and melted cheese mixed with bits of green spinach and red peppers, the middle layer is creamy and light yellow with visible spinach and small red vegetable pieces, and the bottom layer contains cooked pieces of light brown potatoes and some egg mixture. Next to the casserole on the plate are roasted potato chunks that are golden brown and crisp. A silver fork rests on the edge of the plate. The plate sits on a white marbled surface with a dark green cloth partly visible underneath. Photo taken with an iphone --ar 2:3 --v 7

Ingredients & Why They Work

The ingredients in this Overnight Sausage Egg Bake Recipe strike a beautiful balance between hearty, fresh, and creamy. Each one brings something essential to the table—and with some simple shopping tips, you’ll get the best results.

Flat lay of raw ground sausage in a mound, two cloves of peeled garlic, a small white bowl of olive oil, a handful of fresh green spinach leaves, two large diced red and yellow bell peppers mixed together, half of a medium yellow onion diced, a dozen whole large brown eggs with clean uncracked shells, a small white bowl filled with fresh milk, a small white bowl containing shredded cheese, a white ceramic bowl with mixed salt and black peppercorns placed symmetrically, all ingredients arranged neatly in perfect balance and symmetry, placed on a clean white marble surface, soft natural light, photo taken with an iPhone, professional food photography style, fresh ingredients, white ceramic bowls, no bottles, no duplicates, no utensils, no packaging --ar 2:3 --v 7 --p m7354615311229779997

Sausage: I always remove the casing to break it up easily; browning it first enhances flavor and texture.
Olive oil: Adds a mild richness for sautéing veggies without overpowering the dish.
Garlic: Minced garlic infuses just the right amount of savory depth.
Fresh spinach: Wilts down beautifully and adds vibrant color and nutrition.
Bell peppers: Use colorful peppers for sweetness and crunch.
Yellow onion: Sautéed until soft, it provides a subtle sweetness that complements the sausage.
Salt and pepper: Essential to season each layer and tie flavors together.
Eggs: The star binder that creates a custardy, fluffy texture when baked.
Milk: Any type works; it lightens the egg mixture for a tender finish.
Shredded cheese: Divided to melt inside and sprinkle on top for gooey, savory pockets.

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Note: You'll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Make It Your Way

I love experimenting with this Overnight Sausage Egg Bake Recipe because it’s so forgiving. Sometimes, I swap in kale instead of spinach or try spicy chorizo sausage for an extra kick. Feel free to tailor it to your cravings or dietary needs!

Variation: One morning, I added mushrooms and swapped cheddar cheese for pepper jack—it turned out fantastic and gave it a Southwestern flair!
Vegetarian version: Just swap the sausage with a plant-based alternative or extra veggies like zucchini and mushrooms.
Seasonal swaps: In the fall, adding diced butternut squash or roasted sweet potatoes elevates this dish into a cozy seasonal wonder.

Step-by-Step: How I Make Overnight Sausage Egg Bake Recipe

Step 1: Brown the Sausage

Start by removing the casing from your sausage and browning it in a large skillet over medium heat. Even if you have fully cooked sausage, I find a light browning step adds fantastic flavor and texture. Once browned, evenly spread it into your greased casserole dish and set it aside.

Step 2: Sauté the Veggies

Using the same skillet, add a splash of olive oil if needed, then toss in minced garlic, fresh spinach, diced bell peppers, and yellow onion. Sauté until veggies are tender and the spinach is wilted—about 6 to 7 minutes. Season with salt and pepper near the end to enhance their natural sweetness and savoriness.

Step 3: Combine Sausage and Vegetables

Mix the sautéed veggies into the brown sausage in your casserole dish. You want the mixture evenly distributed but don’t over-stir—just a rough mix is perfect. This base is the heart of your breakfast casserole.

Step 4: Whisk Eggs and Cheese

In a medium bowl, whisk together 12 large eggs, half a cup of milk, and half of your shredded cheese. Pour the egg mixture evenly over the sausage and veggie layer—it’ll seep through and bind everything together beautifully as it bakes.

Step 5: Add Final Cheese and Seasoning, Then Bake

Sprinkle the remaining shredded cheese on top along with a pinch of salt and pepper. At this point, you can cover and refrigerate the casserole overnight or proceed directly to baking. When ready, bake at 375ºF (191ºC) for about 45 minutes or until the edges turn golden and the center is set. Let it cool for 15 minutes before serving to help it firm up nicely.

Top Tip

Through countless breakfasts making this Overnight Sausage Egg Bake Recipe, I’ve learned a few tips that make all the difference between good and amazing.

Use fresh veggies: Nothing beats the flavor of fresh spinach and crisp bell peppers versus frozen or canned—your casserole will have a vibrant, fresh taste.
Don’t overmix the eggs: Whisk them just until combined. Overbeating can create a rubbery texture when baked.
Let it rest after baking: That cooling time helps the bake set fully, making it easier to slice and serve without falling apart.
Grease your dish well: This helps with easy cleanup and ensures the edges don’t stick and dry out.

How to Serve Overnight Sausage Egg Bake Recipe

Garnishes

I usually top my egg bake with a sprinkle of fresh chopped parsley or chives to add a burst of color and a pop of fresh flavor. Sometimes, a dollop of sour cream or a few slices of avocado on the side adds creaminess that offsets the savory sausage perfectly.

Side Dishes

To round out the meal, I love serving this with fresh fruit salad or a warm, crusty piece of sourdough. For that extra indulgence, crispy breakfast potatoes or a simple hash brown work beautifully to soak up any leftover egg bake goodness.

Creative Ways to Present

For a brunch party, I like to spoon the casserole into individual ramekins before baking. It makes each serving feel special and perfect for fancy gatherings. Another fun idea is layering additional toppings like sliced tomatoes and a sprinkle of feta for a Mediterranean twist.

Make Ahead and Storage

Storing Leftovers

I store leftovers covered tightly with foil or plastic wrap in the fridge—this casserole keeps well for up to five days. I’ve found keeping it well-covered avoids drying out and keeps every bite flavorful.

Freezing

Freezing this egg bake is a total game-changer. I usually freeze it unbaked, tightly wrapped in plastic and foil, for up to two months. Then, thaw it overnight in the fridge and bake fresh the next day—the texture and flavor hold up beautifully.

Reheating

To reheat, I either microwave individual slices for about a minute or pop them in a 350ºF oven for 15 to 20 minutes until warmed through. Oven reheating keeps the edges crisp, while the microwave is perfect for a speedy fix.

Frequently Asked Questions:

Can I use other types of sausage in this recipe?

Absolutely! This Overnight Sausage Egg Bake Recipe works well with pork, turkey, chicken, or even spicy chorizo sausage. Just adjust cooking times slightly based on the sausage’s pre-cooked status.

Is it necessary to brown the sausage before adding it?

Browning the sausage isn’t mandatory if you’re using fully cooked sausage, but I recommend it for extra flavor and texture. It caramelizes the meat and adds depth to the casserole.

Can this recipe be made vegetarian?

Yes! Simply replace the sausage with a plant-based sausage alternative or increase the amount of vegetables like mushrooms, zucchini, and extra bell peppers to keep it hearty and satisfying.

How far in advance can I prepare this casserole?

You can prepare this Overnight Sausage Egg Bake Recipe up to 24 hours in advance. Just cover it tightly and refrigerate until you’re ready to bake. It’s perfect for busy mornings or entertaining!

Final Thoughts

This Overnight Sausage Egg Bake Recipe holds a special place in my kitchen because it takes the stress out of breakfast without sacrificing flavor or comfort. Whether you’re feeding family, hosting friends, or just want a nourishing start to your day, this recipe has you covered. Give it a try—you’ll find yourself reaching for it again and again, just like I do!