Simple Breakfast Casserole

Let me be honest with you. Mornings are chaotic. And the last thing anyone wants to do is stand over a stove flipping eggs while everyone’s half-asleep and hungry.

That’s exactly why I keep coming back to this recipe.

This simple breakfast casserole has everything — sausage, hash browns, bell peppers, eggs, and melty cheddar cheese — all baked together in one dish. It’s the kind of meal that feeds a crowd without stressing you out.

And the best part? You can make it the night before.

Why You’ll Actually Love This

I’m not someone who makes the same recipe over and over unless it’s really worth it. This one earns its spot.

Think of it like building a lasagna — except easier, faster, and ready for breakfast. Every layer adds something:

• Hash browns give you that crispy, hearty base
• Sausage brings the rich, savory flavor
• Eggs and cheese hold everything together into a fluffy, golden bake
• Peppers and onions add color and a little freshness
• Spinach sneaks in some nutrition (optional, but worth it)

The result? A cheesy, filling, one-pan breakfast that disappears fast.

I first made this on Christmas morning when I needed something special but had zero energy for complicated cooking. It’s been a holiday staple ever since.

What You’ll Need

No fancy ingredients here. Just good, simple stuff.

Ingredient	Amount	Notes
Shredded hash brown potatoes	20 oz	Frozen works great
Pork sausage	1 lb	Spicy works too
Onion	½ medium, chopped
Red bell pepper	½, chopped
Green bell pepper	½, chopped
Garlic	3 cloves, minced
Large eggs	12
Half-and-half	1 cup	Milk works, just less creamy
Salt	½ tsp
Fresh baby spinach	2 cups, chopped	Optional
Cheddar cheese, grated	2 cups, divided

A quick note on the ingredients:

• Frozen hash browns are your best friend here. Convenient, budget-friendly, and they bake up with perfectly crispy edges.
• Half-and-half makes the eggs soft and tender. Don’t skip it if you can help it.
• Cheddar cheese melts beautifully. But honestly, any melting cheese works.

Tools You’ll Need

Nothing complicated. Just the basics:

• Large skillet
• Mixing bowl
• Whisk
• 9×13 baking dish
• Spatula or wooden spoon
• Measuring cups and spoons

How to Make It

Step 1: Get Set Up

Preheat your oven to 375°F (190°C).

Lightly grease your 9×13 baking dish with butter or cooking spray. If your hash browns are frozen solid, let them thaw a bit so they spread evenly. Trust me — it makes a difference.

Step 2: Cook the Sausage and Vegetables

Heat a large skillet over medium heat. Add the sausage and cook until browned, breaking it into crumbles as it cooks.

Once the sausage is mostly done, add:

• Chopped onion
• Red bell pepper
• Green bell pepper

Cook for about 5 minutes until everything softens up. Then stir in the minced garlic and cook for 30 more seconds — just until you smell it.

Remove from heat.

Step 3: Build the Casserole

Now comes the fun part. Layer it up:

1. Spread the hash browns evenly across the bottom of your baking dish
2. Pour the sausage and vegetable mixture on top
3. Sprinkle the chopped spinach over everything (if using)
4. Add 1 cup of the shredded cheddar cheese

Step 4: Make the Egg Mixture

In a large bowl, whisk together:

• 12 eggs
• 1 cup half-and-half
• ½ tsp salt

Whisk it until it’s smooth and just a little frothy. This is what makes the eggs fluffy — don’t rush it.

Step 5: Pour and Top

Pour the egg mixture slowly and evenly over the whole casserole. Then sprinkle the remaining 1 cup of cheddar on top.

Step 6: Bake

Slide it into the oven. Bake for 35–45 minutes, until the eggs are fully set and the top is golden and bubbly.

Want to check if it’s done? Stick a knife in the center. If it comes out clean… you’re ready.

Step 7: Rest, Slice, and Serve

This part takes patience. Let the casserole rest for 5–10 minutes before cutting into it. I know it’s tempting. But resting helps it firm up so your slices actually hold together.

Cut into squares. Serve warm.

Pro Tips Worth Knowing

Thaw the hash browns first. Even 10–15 minutes of thawing makes a big difference. Frozen solid hash browns can leave watery spots in your casserole.

Drain the grease. Some sausages are fattier than others. If you notice a lot of grease in the pan, drain some before assembling. Nobody wants a greasy casserole.

Don’t overbake. Pull it out when the eggs are just set. Overbaking dries the whole thing out.

Always let it rest. Five minutes. That’s all it takes to go from sloppy mess to clean, sliceable squares.

Substitutions and Variations

Here’s the thing about this recipe — it’s more of a framework than a strict formula. Swap things around based on what you have.

Try different proteins:

• Turkey sausage
• Chicken sausage
• Diced ham
• Cooked bacon

Mix up the cheese:

• Monterey Jack
• Mozzarella
• Pepper Jack (great if you like heat)
• Swiss

Add more vegetables:

• Mushrooms
• Zucchini
• Tomatoes
• Broccoli

Want more heat? Toss in crushed red pepper flakes, diced jalapeños, or spicy sausage.

Going vegetarian? Skip the sausage entirely. Load it up with mushrooms, spinach, and extra peppers. Still really good.

What to Serve Alongside It

This casserole is filling on its own. But if you’re hosting brunch, a few lighter sides round it out nicely:

• Fresh fruit salad — adds brightness and cuts through the richness
• Toast or biscuits — buttery and perfect for soaking up any extra egg
• Yogurt parfait — yogurt, granola, berries. Simple and refreshing
• Avocado slices — creamy, cool, and pairs beautifully with the savory flavors

Make-Ahead Instructions

This is probably my favorite thing about this recipe. You can do all the work the night before.

Here’s how:

1. Assemble the casserole completely
2. Cover tightly with foil or plastic wrap
3. Refrigerate overnight
4. In the morning, pull it out and bake as directed

One heads up — you may need 5–10 extra minutes of baking time since it’s going in cold from the fridge.

Storage and Leftovers

Storage Method	Duration	How to Reheat
Refrigerator (airtight container)	3–4 days	Microwave 1–2 min, or oven at 350°F
Freezer (wrapped tightly by portion)	Up to 2 months	Oven or microwave from frozen

Freezing tip: Let the casserole cool completely before cutting and wrapping. Rushing this step leads to soggy portions.

Frequently Asked Questions

Can I make this the night before? Yes — and honestly, I recommend it. Assemble the night before, refrigerate, bake in the morning.

Do I need to cook the hash browns first? Nope. They cook perfectly right in the oven.

Can I use milk instead of half-and-half? You can. Just know the eggs will be slightly less creamy and rich.

How do I know when it’s done? The center should look set, not jiggly. A knife inserted in the middle should come out clean.