This Best Breakfast Casserole is the ultimate holiday dish because it’s incredibly flavorful, high-protein, and perfect for Christmas morning or any morning. It bakes into a fluffy, cheesy, sausage-filled casserole that feels festive yet easy enough for any day of the year. Even better, it’s wonderful for breakfast, brunch, or breakfast-for-dinner because it’s comforting, filling, and absolutely delish. Since it reheats beautifully, it’s also make-ahead friendly—ideal for busy families.
This recipe was inspired by another favorite on my site Sausage Potato Casserole and tastes incredible served alongside this delicious Overnight French Toast
Jump to:
- Why You’ll Love This Best Breakfast Casserole
- Equipment Needed for the Best Breakfast Casserole
- Ingredients + Why They Work (with Substitutions)
- How to Make the Best Breakfast Casserole
- Variations for the Best Breakfast Casserole
- Tips for the Best Breakfast Casserole
- Why High-Quality Eggs Matter
- Why This Best Breakfast Casserole Is a High-Protein Meal
- How to Store, Freeze & Reheat the Best Breakfast Casserole
- FAQ About the Best Breakfast Casserole
- Other Breakfast Recipes
- More Cooking With Lori Recipes
- Best Breakfast Casserole
Why You’ll Love This Best Breakfast Casserole
You will absolutely love this Best Breakfast Casserole for so many reasons, and as you’ll see, it truly fits any season of life or celebration.
- Super flavorful thanks to savory sausage, fluffy eggs, and melted cheese.
- High in protein, which keeps you full longer and powers you through the morning.
- Kids and adults love it, making it a go-to breakfast for a crowd.
- It’s filling yet not heavy, so it’s wonderfully balanced.
- The perfect Christmas morning breakfast casserole—festive, cozy, and effortless.
- Make-ahead friendly, allowing you to prep in advance and simply reheat.
- Budget-friendly ingredients, which makes it as practical as it is delicious.
- Naturally easy to customize, so you can add veggies, spice, or different proteins.
- Always reliable, because it bakes evenly and slices beautifully.
Equipment Needed for the Best Breakfast Casserole
Using the right tools ensures your Best Breakfast Casserole turns out perfect every time.
- Measuring cups – to measure the ingredients precisely.
- Electric beater + large bowl – to mix the eggs until light and fluffy.
- Sauté pan – to brown the breakfast sausage and onions.
- 9×13 baking dish – for even baking and easy slicing.
Ingredients + Why They Work (with Substitutions)
- Eggs – They create the fluffy structure of this Best Breakfast Casserole. Substitute: liquid egg whites or a plant-based egg alternative.
- Flour – Helps stabilize the eggs so the casserole rises evenly. Substitute: gluten-free flour for a gluten free breakfast casserole.
- Salt – Enhances savory flavors and balances the richness. Substitute: sea salt, seasoned salt, or omit if needed.
- Baking Powder – Adds lift and keeps the center tender. Substitute: a 1:1 gluten-free baking powder.
- Cottage Cheese (low-fat or regular) – Adds creaminess, protein, and moisture. Substitute: ricotta cheese or Greek yogurt.
- Shredded Cheese – Melts throughout the casserole for rich flavor. Substitute: cheddar, Colby Jack, mozzarella, or dairy-free cheese.
- Melted Butter – Adds richness and helps brown the edges. Substitute: olive oil or ghee.
- Breakfast Sausage – Provides protein and hearty flavor. Substitute: turkey breakfast sausage, chicken sausage, or plant-based sausage.
See recipe card for quantities.
How to Make the Best Breakfast Casserole
Step 1: Brown the sausage in a large sauté pan until the sausage is cooked, then stir in the butter to melt.
Step 2: Beat the eggs in a large bowl with an electric mixer for about 2 minutes until light and fluffy.
Step 3: Add the flour, salt, baking powder, cottage cheese, and shredded cheese to the eggs and mix until fully combined.
Step 4: Prepare your baking dish by lining a 9×13 pan with parchment paper or lightly greasing it, then pour in the casserole mixture.
Variations for the Best Breakfast Casserole
- Spicy Version – Add diced jalapeños, crushed red pepper, pepper jack cheese, or hot sausage.
- Veggie-Loaded Version – Stir in spinach, bell peppers, mushrooms, or zucchini.
- Meat Lovers – Add diced ham or crumbled bacon.
- Southwestern Twist – Add green chiles, taco seasoning, and cheddar.
- Italian Style – Swap sausage for Italian sausage and add basil + mozzarella.
Tips for the Best Breakfast Casserole
- Use high-quality eggs for a brighter color and richer flavor.
- You can use gluten-free flour or regular flour with excellent results.
- Either low-fat or regular cottage cheese works beautifully.
- Line the pan with parchment paper for easy cleanup and easier slicing.
- Bake a day ahead and warm before serving for stress-free holidays.
- If the sausage is greasy, strain it before adding to the casserole.
- Allow the casserole to cool 10 minutes before slicing so it sets properly.
- To reheat evenly, cover with foil to prevent overbrowning.
Why High-Quality Eggs Matter
High-quality eggs not only give your Best Breakfast Casserole a deep golden color, but they also offer richer flavor and a smoother texture. Additionally, pasture-raised and organic eggs often contain more omega-3s, higher protein density, and better overall nutrient profiles. Because the eggs are the backbone of this casserole, starting with the best makes every bite better.
Why This Best Breakfast Casserole Is a High-Protein Meal
This Best Breakfast Casserole is naturally high in protein thanks to the powerhouse combination of eggs, cottage cheese, shredded cheese, and breakfast sausage. Each serving contains 23 grams of protein, making it incredibly satisfying and energizing—perfect for busy mornings or feeding a crowd. Additionally, this protein-rich blend helps stabilize blood sugar, supports muscle repair, and keeps you full longer. Because it includes several high-quality protein sources, it’s a nourishing breakfast that truly fuels your day.
How to Store, Freeze & Reheat the Best Breakfast Casserole
- Store: Refrigerate leftovers in an airtight container for 3–4 days.
- Freeze: This casserole freezes extremely well. Freeze slices in Souper Cubes for quick reheating.
- Reheat: Warm in the oven at 325°F for 10–15 minutes or microwave individual portions for 60–90 seconds.
FAQ About the Best Breakfast Casserole
It can be! Simply swap the flour for your favorite gluten-free blend to make a gluten free breakfast casserole.
Yes, absolutely—turkey sausage works perfectly.
Typically 35 minutes, but oven variations may require an extra 5 minutes.
Prepare, bake, refrigerate, and reheat the day of serving.
Yes—bake in two dishes for the best results.
Other Breakfast Recipes
- Easy Quiche
- Potato Crust Quiche
- Overnight French Toast
- Christmas Breakfast Casserole
- Million Dollar Bacon
- Easy Wassail
- Fall Breakfast Hash
- Simple Dutch Baby
- Protein Hot Chocolate
- Lemon Poppy Seed Muffins
More Cooking With Lori Recipes
Best Breakfast Casserole
Equipment
- electric hand mixer
Ingredients
- 10 eggs
- ½ C flour - gluten free or regular
- 1 t salt
- 1 t baking powder
- 1 pint cottage cheese -low-fat or regular
- 1 lb shredded cheese - mild or medium cheddar colby jack, mexican blend
- ¼ C melted butter
- 1 lb breakfast sausage
Instructions
- Brown the sausage in a large sauté pan on medium-high heat. Strain if excess grease or liquid.
- Add butter to the browned sausage and allow it to melt.
- In a large bowl, beat eggs until light and fluffy (2 minutes).
- Add browned sausage, flour, salt, baking powder, cottage cheese, and shredded cheese to the egg mixture. Mix with an electric mixer.
- Line a 9×13 baking dish with parchment paper or lightly grease the sides and bottom.
- Bake at 350°F for 35 minutes or until lightly browned and firm in the center.
Notes
- Spicy Version – Add diced jalapeños, crushed red pepper, pepper jack cheese, or hot sausage.
- Veggie-Loaded Version – Stir in spinach, bell peppers, or mushrooms.
- Meat Lovers – Add diced ham or crumbled bacon.
- Southwestern Twist – Add green chiles, taco seasoning, and cheddar.
- Italian Style – Swap sausage for Italian sausage and add basil + mozzarella.
- Use high-quality eggs for a brighter color and richer flavor.
- You can use gluten-free flour or regular flour with excellent results.
- Either low-fat or regular cottage cheese works beautifully.
- Line the pan with parchment paper for easy cleanup and easier slicing.
- Bake a day ahead and warm before serving for stress-free holidays.
- If the sausage is greasy, strain it before adding to the casserole.
- Allow the casserole to cool 10 minutes before slicing so it sets properly.
- To reheat evenly, cover with foil to prevent over browning.
