Egg Bake Recipe With Chicken Sausage: Protein-Packed Breakfast Casserole

This protein-packed breakfast casserole solves the morning rush with minimal effort and maximum flavor. I developed this recipe during busy weekdays when a fast, satisfying meal was non-negotiable.

Chicken sausage and eggs form the perfect base, delivering lean protein that keeps you full for hours. The dish bakes in one pan, requiring just 30 minutes start to finish with almost no hands-on time.

What emerges is a golden, set custard studded with savory sausage pieces—equally good fresh from the oven or reheated for meal prep. The texture stays soft yet firm, never rubbery.

Ideal for feeding a crowd or portioning for the week. Here’s how to make it right the first time.

Ingredients for Egg Bake Recipe with Chicken Sausage

Pantry staples meet protein powerhouses for this easy morning dish.

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The chicken sausage is non-negotiable here. Look for pre-cooked links at Trader Joe’s or Whole Foods—they’re lean, flavorful, and save you the hassle of raw meat. I grab the spinach and feta variety (the good stuff, not the pre-crumbled kind) for extra kick. The cheddar matters too—block cheese shredded at home melts way better than pre-shredded. Skip the low-fat milk; this is a custard, not a diet shake.

No chicken sausage? Turkey sausage or diced ham works in a pinch. Swap cheddar for Pepper Jack at one-to-one ratio if you like heat. Fresh herbs? Double the dried and call it good. The bell pepper can be green (I won’t tell), but red adds that sweetness. The flour is just a thickener—cornstarch at half the amount gets you the same result if you’re gluten-free.

Bake, cool, then slice into portions. Keeps 4-5 days in the fridge or 3 months frozen. Reheats like a dream—microwave 90 seconds, or oven at 350°F for 15 minutes (worth the extra minute).

Step-by-Step Instructions for Egg Bake With Chicken Sausage

Here’s the method I use for a fast, protein-packed casserole everyone will love.

Step 1: Prep the Vegetables and Sausage

Finely dice the yellow onion and red bell pepper—you want small, even pieces so they cook through quickly. Mince the 3 cloves garlic cloves as well. I like to keep my knife sharp for this; dull blades crush instead of slice.

Slice the 1 lb Chicken Sausage Links into ½-inch rounds. Since they’re pre-cooked, this just warms them through and adds texture. Set these aside with your veggies—this prep work ensures the assembly goes fast.

Step 2: Create the Custard Base

In a large bowl, whisk the 12 whole Large Eggs until the yolks and whites are fully combined. Add the 1.5 cups Whole Milk, 0.5 cup All-Purpose Flour, 1 tsp Baking Powder, 1.5 tsp Kosher Salt, 1 tsp Ground Black Pepper, 0.5 tsp Dried Thyme, and 0.5 tsp Dried Mustard.

Whisk vigorously for 1-2 minutes until the mixture is smooth and slightly frothy. This step is crucial—the flour and baking powder need to be fully incorporated to avoid lumps and ensure the custard rises properly during baking.

Step 3: Sauté Aromatics and Assemble the Bake

Melt the 2 tbsp Unsalted Butter in a large skillet over medium heat. Add the diced yellow onion, red bell pepper, and garlic cloves. Sauté for 5-6 minutes until the vegetables soften and the onion turns translucent.

Spread the sautéed veggies and sliced Chicken Sausage Links evenly across a greased 9×13-inch baking dish. Pour the custard mixture over the top, then sprinkle all 2 cups Sharp Cheddar Cheese evenly on top. Gently press down to ensure everything is submerged.

Step 4: Bake Until Golden and Set

Preheat your oven to 375°F. Bake the casserole uncovered for 35-40 minutes until the top is golden brown and the center is set. You can test this by inserting a knife into the middle—it should come out clean with no liquid custard clinging to it.

If the top starts browning too quickly, tent the dish with foil for the remaining time. This dish moves fast once it hits the oven, so keep an eye on it. The edges should pull away slightly from the pan when it’s done.

Creative Variations of This Dish

Spinach & Feta Twist

Swap 1 cup chopped spinach and ½ cup crumbled feta for the bell pepper. I love grabbing pre-washed baby spinach from my local Trader Joe’s—it wilts beautifully into the custard. The feta adds a tangy contrast that cuts through the richness of the eggs and sausage. 💡

Southwest Flare

Add 1 diced jalapeño and 1 tsp cumin to the veggie sauté, then top with 1 cup shredded Pepper Jack instead of cheddar. Stir ½ cup corn kernels into the custard for extra texture. This version reminds me of weekend brunches with friends.

Mediterranean Style

Replace the sausage with 1 lb diced ham and add ½ cup sun-dried tomatoes and ¼ cup chopped kalamata olives to the veggie mix. Top with 1 cup shredded mozzarella and sprinkle 1 tsp dried oregano over everything before baking.

Cheesy Broccoli Version

Add 2 cups chopped broccoli florets to the sautéed veggies. Use 1 cup sharp cheddar and 1 cup Monterey Jack for the topping. The broccoli adds a nice bite and extra nutrition without overpowering the dish. 🥗

Herb Lovers’ Variation

Boost the flavor with 1 tbsp fresh chopped rosemary and 1 tbsp fresh chopped parsley added to the custard. I like to use my Boston neighborhood market for fresh herbs—they make such a difference. This is perfect when I’m craving something a little more aromatic.

Gluten-Free Swap

Replace the all-purpose flour with ¼ cup cornstarch for the same thickening power. Everything else stays the same, and you won’t notice a difference in texture. This works great when I’m cooking for gluten-sensitive friends.

Frequently Asked Questions