Name: Sausage and Egg Cottage Cheese Breakfast Casserole
Prep time: 10 min
Cook time: 50 min
Total time: 60 min
Ingredients: 1 Tbspavocado oil; 1/2 yellow oniondiced; 3 clovesgarlicminced; 1 poundbreakfast sausage; 1 red bell pepperdiced; 6 cupsbaby spinachchopped; 1 tspsea saltto taste; 1/4 tspblack pepper; 1/4 cupall-purpose flour*; 12 largeeggs; 16 ouncescottage cheese**; 8 ouncescolby jack cheesegrated; 1 bunch green onionschopped

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This casserole is the kind of breakfast that feeds a crowd, keeps well, and somehow feels both hearty and light. It starts with browned breakfast sausage and a mix of vegetables, then gets bound together with beaten eggs and cottage cheese for a tender, custardy interior. The top is finished with melted Colby Jack for a familiar, melty finish.

I test recipes the way I live: practical, straightforward, and with an eye toward what makes mornings easier. You can assemble most of this the night before, or throw it together in the morning if you prefer a fresh bake. Either way, the result is reliable—well-seasoned, protein-forward, and easy to portion.

Below you’ll find the ingredients listed exactly as used, step-by-step directions pulled from the recipe source, and practical notes on tools, substitutions, storage, and common fixes. No fluff—just the details you need to get a great breakfast casserole on the table.

The Ingredient Lineup

Ingredients

1 Tbsp avocado oil — for sautéing the aromatics and browning the sausage; neutral and heat-stable.
½ yellow onion, diced — builds savory depth; dice small so it softens quickly.
3 cloves garlic, minced — adds aroma and savory punch; stir in toward the end of the onion cook.
1 pound breakfast sausage — the salty, spiced backbone of the dish; use raw sausage and brown it fully.
1 red bell pepper, diced — adds sweetness and color; remove seeds and dice evenly.
6 cups baby spinach, chopped — wilts down a lot; chopping helps distribute it evenly through the casserole.
1 tsp sea salt — seasons the filling; taste and adjust with care if sausage is very salty.
¼ tsp black pepper — a touch of heat to balance the richness.
¼ cup all-purpose flour* — binds a bit of the mixture and helps stabilize the custard; see note below.
12 large eggs — primary binder and source of structure; whisk until uniform.
16 ounces cottage cheese** — lends creaminess and moisture; breaks down into the egg mix when whisked.
8 ounces Colby Jack cheese, grated — half goes into the egg mix, half is sprinkled on top for a golden finish.
1 bunch green onions, chopped — scattered on top for freshness and a mild onion bite.

Directions: Sausage and Egg Cottage Cheese Breakfast Casserole

Preheat the oven to 350°F. Spray a 9″ x 13″ baking dish with cooking spray and set aside.
Heat the avocado oil in a large skillet (12-inch with a deep lip) or Dutch oven over medium-high heat.
Add the diced yellow onion and sauté, stirring occasionally, until the onion begins to soften, about 3 minutes.
Add the minced garlic and cook, stirring, for 1–2 minutes more until fragrant.
Add the raw breakfast sausage to the skillet. Break it into small pieces with a spatula and cook, stirring and breaking up the meat, until the sausage is fully browned and no pink remains, about 5–8 minutes.
Stir in the diced red bell pepper, chopped baby spinach, sea salt, and black pepper. Cook, stirring, until the spinach has wilted, about 2–3 minutes.
Sprinkle in the all-purpose flour and stir until it is evenly incorporated into the sausage-vegetable mixture. Remove the skillet from the heat and let the mixture cool for about 5 minutes.
Transfer the sausage and vegetable mixture to the prepared baking dish and spread it into an even layer.
In a large bowl, crack and whisk the eggs until well beaten. Add the cottage cheese and half of the grated colby jack cheese; mix until combined.
Pour the egg-and-cottage-cheese mixture evenly over the sausage and vegetables in the baking dish. Use a fork or spoon to gently stir so the ingredients are fairly well distributed.
Sprinkle the remaining colby jack cheese over the top of the casserole. Cover the dish tightly with aluminum foil.
Bake on the center rack for 40 minutes. Remove the foil and continue baking for an additional 25–35 minutes, or until the eggs are set, the top is golden-brown, and an instant-read thermometer inserted into the center reads 160°F (71°C).
If you prefer a crispier, more browned top, broil the casserole for 4–5 minutes—watch closely to avoid burning.
Remove the casserole from the oven and let it cool for 15 minutes before slicing. Sprinkle the chopped green onions on top before serving.
To store: wrap the baking dish in plastic wrap and refrigerate for up to 7 days, or transfer leftovers to an airtight container. You may also freeze portions in freezer bags for up to 3 months.

Why It Deserves a Spot

This casserole hits a few important marks: it’s high-protein, forgiving, and flexible. The cottage cheese keeps the texture creamy without relying on heavy cream, so the final bake is custardy but not greasy. Using a full pound of breakfast sausage gives the dish obvious savory flavor, while the spinach and red pepper add color, nutrients, and balance.

It’s a weeknight-and-weekend recipe. Assemble it for brunch guests or make it on a Sunday to carry you through the week. It slices neatly and reheats well, which is exactly what you want when mornings are busy.

If You’re Out Of…

Breakfast sausage — substitute with crumbled pork sausage, bulk Italian sausage (keep spice in mind), or browned ground turkey for a lighter option. No extra quantities needed; use roughly 1 pound.
Cottage cheese — ricotta makes a reasonable stand-in if you prefer a smoother texture, or plain Greek yogurt for tang (use the same volume). Drain yogurt slightly if very loose.
Colby Jack — any mild melting cheese will work: cheddar, monterey jack, or a blend. Stick with 8 ounces total, splitting half into the eggs and half on top for consistency.
All-purpose flour — if you need a gluten-free option, use a 1:1 gluten-free flour blend in the same amount; the role is to slightly thicken and stabilize the filling, so keep the 1/4 cup measure.

Toolbox for This Recipe

12-inch skillet with a deep lip or Dutch oven — for browning sausage and wilting greens.
9″ x 13″ baking dish — holds the casserole; nonstick or sprayed with cooking spray per directions.
Mixing bowl and whisk — for beating eggs and combining with cottage cheese.
Measuring spoons and cups — to follow the recipe amounts exactly.
Instant-read thermometer — optional but recommended to confirm the center reaches 160°F (71°C).
Aluminum foil — to cover while the casserole bakes through.

Watch Outs & How to Fix

Runny center

If the center is still jiggly after the total bake time, return it to the oven covered for another 5–10 minutes and re-check the temperature. The instant-read thermometer is the quickest way to confirm doneness—you’re aiming for 160°F (71°C).

Top is browning too fast

If the cheese is getting too dark while the center needs more time, tent the casserole with foil and continue baking. Remove the foil again for the last 10 minutes to let the top color up in a controlled way.

Sausage too salty

Some breakfast sausages vary widely in saltiness. Taste a small bite after browning; if it seems very salty, reduce the added sea salt in the recipe (or skip it). Adding a little extra chopped spinach helps diffuse salt intensity.

Too wet after baking

Excess liquid can come from very wet cottage cheese or not enough bake time. Let the casserole rest for the full 15 minutes after baking—this helps it set. If it’s still loose, give it another 10 minutes in a moderate oven (325°F) and then recheck.

Seasonal Flavor Boosts

Small, seasonal changes keep this casserole feeling fresh:

Spring: Fold in thinly sliced asparagus tips or ramps (if available) right after the sausage browns.
Summer: Add diced tomatoes (seeds removed) after baking or stir in roasted corn for sweetness.
Autumn: Stir in small cubes of roasted butternut squash with the sausage for an earthy note.
Winter: Swap part of the spinach for chopped kale and add a pinch of smoked paprika to the sausage for warmth.

Author’s Commentary

I love that this casserole is both forgiving and satisfying. Cottage cheese is sometimes underestimated in hot bakes, but it brings moisture and protein without making the dish heavy. The half-and-half approach with the Colby Jack—mixing some into the eggs and reserving the rest for the top—gives you cheese integrated into the custard and a beautifully melted, golden surface.

When I test this, I focus on texture contrasts: a slightly crisp edge, a soft custardy center, and a bit of chew from the sausage. The green onions on top are non-negotiable for me; they add brightness and a fresh counterpoint to everything else.

Store, Freeze & Reheat

To store: wrap the baking dish in plastic wrap and refrigerate for up to 7 days, or transfer leftovers to an airtight container. The recipe source specifies up to 7 days refrigerated and up to 3 months frozen for portions in freezer bags.

To reheat from refrigerated: slice a portion and microwave on medium power until warmed through (start with 1–2 minutes depending on portion size), or reheat in a 350°F oven for 10–15 minutes covered with foil. From frozen, thaw overnight in the fridge, then reheat as above.

If you prefer, transfer individual portions to oven-safe dishes before freezing; that makes reheating straightforward and helps retain texture.

FAQ

Can I make this ahead? Yes. You can assemble the casserole, cover it, and refrigerate overnight before baking. If refrigerating assembled overnight, allow an extra 5–10 minutes of bake time.
Can I use pre-cooked sausage? Yes. Reduce initial skillet time and simply heat the pre-cooked sausage with the vegetables until warmed before proceeding. Watch salt levels if the sausage is seasoned.
Why is there flour? The 1/4 cup of all-purpose flour helps stabilize the sausage-vegetable mixture and prevent the finished casserole from being too fragile when sliced.
How do I know it’s done? The center should be set and an instant-read thermometer should register 160°F (71°C). The top should be golden-brown.
Can I halve the recipe? Yes. Use a smaller baking dish and adjust baking time—start checking 10–15 minutes earlier.

Bring It to the Table

Serve slices warm with a simple green salad or a bowl of fresh fruit to balance the savory richness. Add hot sauce or salsa on the side for anyone who likes an extra kick. Leftovers make excellent breakfast sandwiches—stack a slice on toasted English muffin with a smear of mustard or aioli.

This casserole is straightforward to execute, easy to scale, and dependable. It’s the kind of recipe you come back to when you need a dependable, crowd-pleasing breakfast that stores and reheats well. Make it for a weekend brunch or prep it for weekday mornings—either way, it’s going to be one less decision on a busy day.

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