This Fireman’s Breakfast Casserole is a hearty dish packed with eggs, sausage, and cheese, perfect for starting the day with a smile. It’s like a warm hug in a pan!
It’s super easy to make, just layer the ingredients and let the oven do the work. I love having leftovers for a quick breakfast. Who doesn’t enjoy breakfast twice? 😄
Key Ingredients & Substitutions
Breakfast Sausage: This dish shines with breakfast sausage, whether it’s bulk or patties. If you’re after a lighter option, try turkey sausage or even plant-based sausage alternatives—both work great!
Eggs: I use large eggs for the best texture. If you’re avoiding eggs, you could substitute them with a flaxseed mix (1 tablespoon flaxseed meal + 2.5 tablespoons water = 1 egg) though the texture might differ slightly.
Cheddar Cheese: Sharp cheddar adds a fantastic flavor. If you want a twist, use pepper jack for some heat or mozzarella for a milder taste. Vegan cheese can also substitute for a dairy-free option!
Onion: Diced onion gives added flavor but is optional. If you dislike onions, consider using chives or green onions for a milder flavor instead.
Milk: Whole milk gives richness, but you can use any milk—almond or soy milk works well for a dairy-free option.
How Do I Ensure Perfect Eggs in My Casserole?
Getting those eggs just right is key! Here are some tips:
- Mix the eggs and milk well to ensure an even distribution.
- Don’t overbake! Keep an eye on your casserole; it’s done when the center is set but still has a little jiggle.
- Let it cool a few minutes before serving. This helps the casserole firm up, making it easier to slice.
Following these tips will give you a fluffy, delicious breakfast casserole that everyone will love!

Fireman’s Breakfast Casserole
Ingredients You’ll Need:
For the Casserole:
- 1 pound breakfast sausage (bulk or patties, crumbled)
- 10 large eggs
- 1 cup milk
- 2 cups shredded sharp cheddar cheese
- 1/2 cup diced onion (optional)
- 1/4 teaspoon black pepper
- 1/4 teaspoon salt
- 1/2 teaspoon garlic powder (optional)
- Cooking spray or butter for greasing the baking dish
Time Needed:
This delicious casserole takes about 15 minutes to prep and about 35-45 minutes to bake. You’ll need a little extra time to cool it down before serving, bringing the total to around 1 hour. Perfect for breakfast or brunch gatherings!
Step-by-Step Instructions:
1. Preheat and Prepare:
First, preheat your oven to 350°F (175°C). While it heats up, grab a 9×13 inch baking dish and lightly grease it with cooking spray or butter to prevent sticking.
2. Cook the Sausage:
In a skillet over medium heat, cook the breakfast sausage until it’s browned and no longer pink. Use a spoon to crumble the sausage as it cooks. If you’re adding onions, toss them in and cook for a few more minutes until they soften. Don’t forget to drain any excess fat if needed!
3. Layer the Ingredients:
Take the cooked sausage and onions out of the skillet and spread them evenly across the bottom of your greased baking dish. Now sprinkle 1 cup of shredded cheddar cheese over the sausage mixture.
4. Mix the Egg Mixture:
In a large mixing bowl, whisk together the eggs, milk, salt, pepper, and garlic powder (if using). Make sure everything is combined well!
5. Pour and Top:
Pour the egg mixture evenly over the sausage and cheese in the baking dish. Lastly, sprinkle the remaining 1 cup of cheddar cheese over the top for that delicious cheesy goodness.
6. Bake to Perfection:
Pop the casserole into your preheated oven and bake uncovered for about 35 to 45 minutes. Keep an eye on it; it’s ready when the eggs are set and the top is a lovely golden brown.
7. Cool and Serve:
Once it’s done baking, let the casserole cool for a few minutes to firm up. Then slice and serve warm. Enjoy the deliciousness!
This casserole is perfect for feeding a crowd or prepping for busy mornings. Enjoy your hearty breakfast! 🍳
Can I Use Turkey Sausage Instead of Pork?
Absolutely! Turkey sausage is a great lean alternative and will work perfectly in this casserole. Just make sure to cook it until it’s browned, just like you would with pork sausage!
How Long Does Leftover Casserole Last?
Leftover Fireman’s Breakfast Casserole can be stored in the refrigerator for up to 3 days in an airtight container. Reheat it in the microwave or oven until warmed through.
Can I Freeze This Casserole?
Yes, you can freeze the casserole before baking it, or after it has cooled down once baked. Wrap it tightly with plastic wrap and foil, and it will be good for up to 2 months. Thaw in the fridge overnight before baking or reheating.
What Can I Add to Make It Even Heartier?
If you want to bulk it up, consider adding cooked vegetables like spinach, bell peppers, or mushrooms. You can also mix in some diced cooked potatoes for extra substance!
