Name: Overnight Chicken Sausage and Vegetable Egg Bake Recipe
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 10 to 12 ounces (280-340g) chicken sausage, casing removed; Olive oil, as needed for cooking; 2 cloves garlic, minced; 3 cups (90g) fresh spinach; 2 large bell peppers, diced; ½ medium yellow onion, diced; Salt and pepper to taste; 12 large eggs; ½ cup (120g) milk (any type); ½ cup (56g) shredded cheese (any flavor), divided

Jump to Recipe· 3.8 from 79 reviews

If you’ve ever wanted a dish that brings together hearty protein, fresh vegetables, and comforting eggs all in one warm, cheesy casserole, you’ve just found your new favorite. The Overnight Chicken Sausage and Vegetable Egg Bake Recipe is that perfect, easy-to-prep breakfast (or brunch!) option that you can assemble the night before and wake up to glorious aromas tempting you from the kitchen. It’s loaded with flavorful chicken sausage, tender spinach and bell peppers, and fluffy eggs all bound together with melty cheese, making it a crowd-pleaser that’s as versatile as it is satisfying.

Ingredients You’ll Need

A black pan filled with a colorful mix of chopped vegetables, including diced red and yellow bell peppers, small white onion pieces, and wilted dark green spinach leaves. The vegetables are evenly spread inside the pan, showing a fresh, sautéing texture. The pan sits on a grid cooling rack, all placed on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

The magic of this recipe lies in its simple, wholesome ingredients. Each one plays a role: the chicken sausage adds savory richness, the vegetables bring freshness and color, and the eggs and cheese provide that luscious, creamy texture we all love in a bake.

10 to 12 ounces chicken sausage (casing removed): Choose your favorite flavor or style, fully cooked or fresh, it’s the main protein star of this dish.
Olive oil: A splash for sautéing veggies and giving them a nice, velvety finish.
2 cloves garlic (minced): Garlic wakes everything up with its fragrant punch.
3 cups fresh spinach: Adds vibrant green color and a gentle earthiness that balances the richness.
2 large bell peppers (diced): Sweet, crunchy, and colorful—perfect for texture and taste.
½ medium yellow onion (diced): Adds subtle sweetness and depth to the veggie mix.
Salt and pepper: Essential for seasoning and bringing harmony to all flavors.
12 large eggs: The fluffy, protein-packed base that ties this egg bake together.
½ cup milk (any kind): Keeps the eggs tender and creamy when baked.
½ cup shredded cheese (any flavor, divided): For that irresistible cheesy layer both inside and on top.

How to Make Overnight Chicken Sausage and Vegetable Egg Bake Recipe

Step 1: Prepare Your Casserole Dish

Start by spraying a 7 by 11-inch or 9 by 13-inch casserole dish with non-stick spray. This simple step ensures your bake won’t stick, making cleanup a breeze later on. If you plan to bake the dish immediately, go ahead and preheat your oven to 375ºF (191ºC) now.

Step 2: Brown the Chicken Sausage

In a large skillet over medium heat, cook your chicken sausage, breaking it up into bite-sized pieces as it browns. This step brings out that savory, caramelized flavor that forms the foundation of the bake. If your sausage is fully cooked already, you can either skip this or just give it a quick warm-up for extra flavor.

Step 3: Sauté the Vegetables

Using the same skillet (and adding a little olive oil if needed), toss in the minced garlic along with the spinach, diced bell peppers, and onion. Cook everything until the veggies soften and the spinach wilts, usually about 6 to 7 minutes. Season with salt and pepper to taste near the end of this step to bring all those veggie flavors to life.

Step 4: Assemble the Sausage and Vegetable Mix

Remove the skillet from heat and transfer the cooked vegetables to the sausage-filled casserole dish. Stir gently so you get an even distribution of meat and veggies in every bite.

Step 5: Whisk Together the Egg Mixture

In a medium-sized bowl, crack 12 eggs and add the milk along with ¼ cup of the shredded cheese. Whisk everything together until you’ve got a smooth, uniform mixture. Pour this egg mixture evenly over your sausage and vegetable combo in the casserole dish.

Step 6: Add the Final Cheese and Seasonings

Sprinkle the remaining ¼ cup of shredded cheese on top, then season with a bit more salt and pepper. Your casserole is now ready to be baked straight away or covered and chilled in the fridge to bake within the next 24 hours.

Step 7: Bake the Casserole

If it’s time to bake, preheat your oven to 375ºF (191ºC) if you haven’t already done so. Pop your dish in and bake for about 45 minutes. You’ll know it’s done when the edges start to turn a lovely golden brown. Let it cool for at least 15 minutes before serving so the flavors settle nicely.

How to Serve Overnight Chicken Sausage and Vegetable Egg Bake Recipe

The image shows a white plate with a thick slice of a baked egg dish in the front center. The dish has three visible layers: a base layer of light yellow eggs with small pieces of red and green vegetables mixed in, a middle layer showing bits of spinach and more vegetables, and a top layer of melted, golden-orange cheese with some browned spots and spinach leaves. Behind this main piece, there are rustic roasted potato pieces that are golden brown and a crispy round piece of reddish-brown sausage. The plate rests on a dark green cloth, and the background is a white marbled texture. A shiny silver fork is placed to the left side, close to the baked egg slice, with a woman's hand partially touching the plate. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Fresh herbs like chopped parsley, chives, or even a sprinkle of crumbled feta bring a fresh pop of flavor and brighten up each slice. A dollop of sour cream or a drizzle of hot sauce can add another exciting layer if you like.

Side Dishes

This egg bake shines on its own but pairs beautifully with some fresh fruit salad for a refreshing contrast or crusty toast to soak up any juicy bits. You might also enjoy a light green salad for a well-rounded brunch spread.

Creative Ways to Present

Serve it family-style in the casserole dish for a cozy gathering or cut into neat squares for a grab-and-go brunch buffet. For a charming touch, plate slices on colorful plates and add contrasting garnishes like roasted cherry tomatoes or avocado slices.

Make Ahead and Storage

Storing Leftovers

Refrigerate any leftovers promptly in an airtight container. This overnight chicken sausage and vegetable egg bake recipe keeps beautifully for up to 5 days, making for easy breakfasts or lunches later in the week.

Freezing

If you want to prep way in advance or save leftovers for longer, freezing is your friend. Wrap the unbaked casserole tightly with plastic wrap and foil and freeze for up to 2 months. When ready, thaw in the fridge overnight before baking as directed.

Reheating

Individual servings reheat wonderfully in the microwave for about 1 to 2 minutes, depending on your microwave’s power. For larger portions, a 350ºF (177ºC) oven for 15 to 20 minutes works perfectly to warm it through without drying out.

FAQs

Can I substitute pork sausage for chicken sausage?

Absolutely! Pork sausage works well too. Just keep in mind cooking times may vary slightly, and adjust seasonings if your sausage is already heavily spiced.

What types of cheese work best in this egg bake?

Cheddar, mozzarella, pepper jack, or even a tangy feta all bring unique flavors that complement the vegetables and sausage. Feel free to experiment and find your perfect combo.

Can I add other vegetables to the recipe?

Yes! Mushrooms, zucchini, or even tomatoes can be added for extra variety. Just sauté them along with the other veggies to ensure they’re tender before baking.

Is it okay to bake this casserole straight after assembling?

Yes, you can bake immediately or refrigerate up to 24 hours before baking. The overnight option allows the flavors to meld together beautifully.

How do I know when the egg bake is fully cooked?

Look for golden edges and a firm center that no longer jiggles when you gently shake the dish. A toothpick inserted in the middle should come out clean or with just a few moist crumbs.

Final Thoughts

This Overnight Chicken Sausage and Vegetable Egg Bake Recipe is one of those dishes that balances ease, flavor, and convenience in the most delightful way. Whether you’re feeding a crowd or just treating yourself to a special breakfast, it’s a dish that will quickly become a go-to staple. Give it a try and enjoy the warm, comforting satisfaction that comes with every bite!