Easy Breakfast Sausage Casserole Recipe

Name: Easy Breakfast Sausage Casserole Recipe
Prep time: 20 min
Cook time: 45 min
Total time: 65 min
Yield: 8
Cuisine: American
Ingredients: 1 lb mild breakfast sausage; 1 small yellow onion, diced; 1 red bell pepper, diced; 6 large eggs; 2 cups whole milk; 1 tsp salt; 1/2 tsp black pepper; 1 tsp dry mustard; 6 slices white bread, cubed; 2 cups shredded cheddar cheese

I’ll never forget the first time I tried to make this Easy Breakfast Sausage Casserole Recipe. It was for my husband’s family on Christmas morning and I was so nervous. I completely forgot to grease the pan. We spent half the morning chiseling it out with a spatula. The bottom was like a cement tile but everyone ate it anyway and said it was great. That’s when I knew this dish was a keeper, even when you totally mess it up.

Recipe Card

Recipe Title	Easy Breakfast Sausage Casserole Recipe
Servings	8
Prep Time	20 minutes
Cooking Time	45 minutes
Calories	Approx. 420 per serving

Ingredients

1 lb mild breakfast sausage
1 small yellow onion, diced
1 red bell pepper, diced
6 large eggs
2 cups whole milk
1 tsp salt
1/2 tsp black pepper
1 tsp dry mustard
6 slices white bread, cubed
2 cups shredded cheddar cheese

The sausage is key, don’t skimp. I once used a fancy spicy Italian sausage thinking it would be gourmet. It was way too greasy and overpowered everything. Stick with plain breakfast sausage. And the bread? I’ve used everything from stale hot dog buns to fancy sourdough. Basic white sandwich bread actually works best, it soaks up the egg perfectly without getting weird.

Directions

Preheat your oven to 350°F and grease a 9×13 inch baking dish really well.
Brown the sausage in a large skillet over medium heat, breaking it up as it cooks.
Add the diced onion and bell pepper to the skillet and cook for 5 more minutes until soft.
In a large bowl, whisk together the eggs, milk, salt, pepper, and dry mustard.
Spread the cubed bread evenly in the bottom of your greased baking dish.
Sprinkle half of the cheese over the bread.
Spread the sausage and veggie mixture over the cheese layer.
Pour the egg mixture slowly over everything in the dish.
Top with the remaining cheese.
Bake for 45-50 minutes, until the top is golden brown and the center is set.
Let it sit for 10 minutes before cutting into it.

The biggest mistake I make is not letting it rest. I’m always so impatient and dive right in. It just turns into a soupy, cheesy mess that doesn’t hold its shape. Those 10 minutes feel like forever but they make all the difference, I promise. It lets everything set up so you get nice clean squares.

This Easy Breakfast Sausage Casserole Recipe has saved me more times than I can count. I love that it’s a true one-pot wonder for busy mornings. The leftovers are honestly just as good, maybe even better, which makes it a fantastic meal prep option. It’s the ultimate comfort food that feels fancy but is so simple to throw together.

My kids call it “cheesy egg bake” and it’s a total family favorite. They even eat the peppers and onions hidden in there, which is a huge win for me. I’ve made it for new parents, for sick friends, and just for our lazy Sunday brunches. It’s just one of those dishes that always works.

If I were to change one thing next time, I might throw in some chopped spinach for a healthy swap. I tried mushrooms once but my husband picked them all out. I think the beauty of this recipe is how flexible it is. You can really make it your own.

Nutrition Info (per serving)

Calories	Carbs	Fat	Protein
420	15g	28g	25g

Okay so it’s not exactly a salad. The nutrition facts are what they are, it’s a hearty breakfast! I’ve made it lighter by using turkey sausage and 2% milk and it was still really good. For my gluten-free friend, I used a GF bread and it worked perfectly. Don’t be afraid to tweak it for your needs.

Ingredient Swaps

Ingredient	Substitution
Breakfast Sausage	Turkey Sausage or Bacon
White Bread	Gluten-Free Bread or Croissants
Cheddar Cheese	Pepper Jack or Swiss
Whole Milk	2% Milk or Half-and-Half

The croissant swap is a game-changer for special occasions, it makes it so rich and buttery. Pepper jack cheese is my go-to when I want a little kick. But I tried using almond milk once and it was a total fail, it just didn’t set right and was kinda watery. Stick with dairy milk for the best results.

Tips

Use day-old or slightly stale bread. It soaks up the egg mixture way better without turning to mush.
Don’t skip the dry mustard! It sounds weird but it adds a depth of flavor you’ll miss if it’s gone.
Let the sausage and veggie mix cool a bit before adding it to the dish. If it’s piping hot, it can start to cook the eggs prematurely.

I learned the hard way about the hot sausage. I was in a huge rush one time and dumped it right from the pan into the baking dish. It started to curdle the egg mixture on contact and I ended up with weird cooked egg bits throughout. Now I just spread it on a plate for a few minutes to cool down. Such a simple fix for a way better texture.

FAQ

Can I make this the night before?
Absolutely! That’s one of the best things about it. Assemble the whole thing, cover it tightly, and pop it in the fridge. Just let it sit on the counter for about 20-30 minutes before baking so the dish doesn’t go from super cold to super hot and crack. You might need to add 5-10 extra minutes to the bake time.

Why is my casserole so watery?
Oh man, I’ve been there. This usually happens if you used really fresh, soft bread or if you didn’t let it rest before cutting. Stale bread is your friend here! Also, make sure your skillet doesn’t have a ton of grease from the sausage. I drain mine on a paper towel after cooking to avoid any extra liquid.

Can I freeze it?
Yes, but the texture of the eggs changes a little bit. It’s still totally edible and great for a quick breakfast! I cut it into individual portions, wrap them in plastic wrap, and then foil. To reheat, thaw it in the fridge overnight and then warm it in the oven or microwave.

That’s everything I know about making Easy Breakfast Sausage Casserole Recipe! Hope you give it a try, and if you mess it up, you’re in good company—I do it all the time.