Easy Breakfast Egg Casserole Recipe

Looking for an easy and delicious breakfast that can feed the whole family? This Easy Breakfast Egg Casserole Recipe is a perfect choice for busy mornings, weekend brunches, holidays, and family gatherings. Made with eggs, breakfast sausage, cheddar cheese, bread, onions, and bell peppers, this hearty casserole combines simple ingredients into a satisfying meal.

One of the best things about this breakfast egg casserole is that you can prepare it the night before and bake it the next morning. That means less time in the kitchen and more time enjoying breakfast with your family. Serve it on its own or pair it with fresh fruit, toast, or a cup of coffee for a complete morning meal.

Why You’ll Love This Breakfast Egg Casserole

• Easy to prepare: Simple ingredients and straightforward instructions make this recipe beginner-friendly.
• Perfect for meal prep: Assemble the casserole ahead of time and refrigerate it overnight.
• Great for a crowd: One 9 × 13-inch baking dish makes eight servings.
• Easy to customize: Change the vegetables, cheese, or protein to suit your preferences.
• Ideal for special occasions: Serve it for holiday breakfasts, brunches, or weekend family meals.

Ingredients You’ll Need

Here are the ingredients needed to make this easy breakfast egg casserole.

• 8 large eggs: The base of the casserole, helping bind all the ingredients together.
• 2 cups whole milk: Adds moisture and helps create a tender egg mixture.
• 1 teaspoon dry mustard: Adds a subtle savory flavor.
• 1 teaspoon salt: Enhances the overall flavor. Adjust the amount to suit your needs.
• ½ teaspoon black pepper: Adds mild seasoning.
• 2 cups cooked breakfast sausage, crumbled: Provides a savory, hearty flavor.
• 4 cups cubed day-old bread: Absorbs the egg mixture and gives the casserole structure.
• 2 cups shredded sharp cheddar cheese, divided: Adds a rich, cheesy flavor.
• 1 cup diced bell pepper: Brings color and a mild sweetness.
• 1 cup diced yellow onion: Adds savory flavor and aroma.

Optional Seasonings

You can add a pinch of cayenne pepper for heat, smoked paprika for a smoky flavor, or fresh thyme and chopped chives for extra freshness.

Ingredient Substitutions

This recipe is flexible, so you can adjust it based on the ingredients you have available.

• Sausage: Replace the breakfast sausage with cooked bacon, diced ham, or cooked turkey sausage.
• Cheese: Use Monterey Jack, mozzarella, Swiss cheese, or a combination of your favorite cheeses.
• Milk: Whole milk works well, but 2% milk can also be used.
• Bread: White bread, French bread, or whole-wheat bread are suitable options.
• Vegetables: Try mushrooms, spinach, zucchini, or chopped tomatoes. Cook vegetables that release a lot of moisture before adding them.
• Seasonings: Add garlic powder, paprika, or dried herbs for extra flavor.

Kitchen Equipment

You’ll need a few basic kitchen tools:

• A 9 × 13-inch baking dish
• A large mixing bowl
• A whisk
• A cutting board and knife
• A skillet for cooking the sausage and vegetables
• Measuring cups and spoons
• Aluminum foil

How to Make Easy Breakfast Egg Casserole

Follow these simple steps for a flavorful breakfast casserole with tender eggs, savory sausage, and melted cheddar cheese.

Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Lightly grease a 9 × 13-inch baking dish with butter or cooking spray to help prevent sticking.

Step 2: Cook the Sausage

Place the breakfast sausage in a skillet over medium heat. Cook, breaking it into small crumbles, until fully cooked. If needed, drain excess grease before setting the sausage aside.

Step 3: Prepare the Vegetables

In the same skillet, cook the diced onion and bell pepper for a few minutes until slightly softened. This helps reduce excess moisture and brings out their flavor.

Step 4: Add the Bread

Spread the cubed bread evenly across the bottom of the prepared baking dish. Day-old bread works particularly well because it absorbs the egg mixture without becoming overly soft.

Step 5: Add the Sausage, Vegetables, and Cheese

Distribute the cooked sausage, onion, and bell pepper evenly over the bread. Sprinkle about 1 cup of shredded cheddar cheese over the top.

Step 6: Whisk the Egg Mixture

In a large bowl, whisk together the eggs, whole milk, dry mustard, salt, and black pepper until well combined.

Pour the egg mixture evenly over the bread, sausage, vegetables, and cheese. Gently press down any exposed bread pieces so they can absorb some of the liquid.

Step 7: Add the Remaining Cheese

Sprinkle the remaining 1 cup of shredded cheddar cheese evenly over the casserole.

Step 8: Bake the Casserole

Cover the baking dish with aluminum foil and bake for 30 minutes. Remove the foil and continue baking for another 15–20 minutes, or until the center is set and the casserole reaches an internal temperature of 160°F (71°C), following USDA food safety guidelines.

Baking times may vary depending on your oven and the temperature of the casserole before baking. If the center is still runny, continue baking and check again.

Step 9: Rest and Serve

Remove the casserole from the oven and let it rest for about 5–10 minutes before slicing. This helps it settle and makes serving easier.

Cut into eight portions and serve warm.

Make-Ahead Breakfast Egg Casserole

This recipe is an excellent option when you want breakfast ready with minimal effort in the morning.

To prepare it ahead of time:

1. Cook the sausage and vegetables as directed.
2. Assemble the bread, sausage, vegetables, cheese, and egg mixture in the baking dish.
3. Cover the dish tightly and refrigerate it overnight.
4. The next morning, preheat the oven to 350°F (175°C).
5. Bake until the center reaches 160°F (71°C).

Because the casserole will be cold from the refrigerator, it may need additional baking time. Check the center with a food thermometer rather than relying on time alone.

For food safety, keep the assembled casserole refrigerated at 40°F (4°C) or below and bake it within a reasonable period, preferably the next morning.

Tips for the Best Breakfast Egg Casserole

Keep these tips in mind for the best results.

• Use slightly dry bread: Day-old bread absorbs the egg mixture well and helps prevent a soggy texture.
• Cook the sausage thoroughly: Fully cook the sausage before adding it to the casserole.
• Remove excess moisture: Sauté vegetables that release a lot of water before assembling the dish.
• Avoid overbaking: Bake until the center reaches 160°F (71°C). Overbaking can make the eggs rubbery.
• Let it rest: Allowing the casserole to rest for a few minutes makes it easier to cut into neat portions.
• Adjust the salt carefully: Sausage, bread, and cheddar cheese can already contain substantial amounts of sodium.

How to Reduce Sodium

Each serving contains an estimated 990 mg of sodium based on the ingredient values used for this recipe. The actual amount can vary depending on the brands and products you choose.

To reduce sodium, use low-sodium breakfast sausage, choose lower-sodium bread and cheese when available, and reduce the added salt. Fresh herbs, black pepper, paprika, and garlic powder can help add flavor without relying on extra salt.

Easy Breakfast Egg Casserole Variations

You can change this recipe to create different flavors and use ingredients you already have.

Ham and Cheese Casserole

Replace the breakfast sausage with diced cooked ham. Use cheddar or Swiss cheese for a classic combination.

Vegetable Breakfast Casserole

Leave out the sausage and add sautéed mushrooms, spinach, and bell peppers. Cook moisture-rich vegetables before adding them to the dish.

Spicy Breakfast Casserole

Add a pinch of cayenne pepper, red pepper flakes, or diced jalapeños to give the casserole a little heat.

Mediterranean-Inspired Casserole

Replace the sausage with sautéed vegetables, add a little crumbled feta, and season with oregano and black pepper.

Low-Carb Breakfast Egg Casserole

For a lower-carbohydrate variation, omit the bread and add two extra eggs with approximately 1½ cups of milk. The texture will be different from the original bread-based casserole, and the baking time may change. Check that the center reaches 160°F (71°C).

What to Serve with Breakfast Egg Casserole

This casserole is filling on its own, but it also pairs well with a variety of breakfast and brunch sides.

• Fresh fruit, such as berries, melon, or orange slices
• A simple green salad
• Roasted breakfast potatoes
• Whole-grain toast or English muffins
• Yogurt with fresh fruit
• Coffee, tea, or fresh orange juice

For a brunch gathering, serve the casserole with fruit and a light side dish to create a balanced spread.

How to Store Leftovers

Proper storage helps keep leftover breakfast egg casserole safe and enjoyable. For additional guidance on storing food safely, check the FoodKeeper App.

Refrigerating

Allow the casserole to cool briefly, then refrigerate leftovers within 2 hours of cooking. If the surrounding temperature is above 90°F (32°C), refrigerate within 1 hour.

Store leftovers in an airtight container in a refrigerator set to 40°F (4°C) or below. Eat them within 3–4 days.

Freezing

You can freeze the baked casserole in individual portions or as a larger piece. Let it cool, divide it into suitable portions, and wrap or store it in freezer-safe containers.

For best quality, use frozen portions within about 2–3 months. Thaw in the refrigerator when possible, then reheat until the center reaches 165°F (74°C).

Reheating

Reheat individual portions in the microwave or warm larger portions in the oven. Covering the casserole while reheating can help prevent it from drying out.

Always reheat leftovers to an internal temperature of 165°F (74°C).

Frequently Asked Questions

Can I make breakfast egg casserole the night before?

Yes. Assemble the casserole, cover it, and refrigerate it overnight. Bake it the next morning until the center reaches 160°F (71°C). It may need extra time because it starts cold.

Can I make this casserole without sausage?

Yes. You can leave out the sausage or replace it with cooked bacon, diced ham, turkey sausage, or sautéed vegetables. If you change the ingredients, the nutrition information will also change.

How do I know when the casserole is done?

The center should be set rather than liquid, and an instant-read food thermometer inserted into the center should register 160°F (71°C).

Why is my breakfast casserole soggy?

Excess moisture from vegetables, very fresh bread, or too much liquid can make the casserole soggy. Use day-old bread, cook moisture-rich vegetables first, and bake until the center is set.

How long does breakfast egg casserole last in the refrigerator?

Store leftovers in a covered container at 40°F (4°C) or below and eat them within 3–4 days.

Can I freeze breakfast egg casserole?

Yes. Freeze the cooked casserole in portions for convenient future breakfasts. For best quality, use it within about 2–3 months and reheat leftovers to 165°F (74°C).

Can I use a different type of cheese?

Absolutely. Monterey Jack, mozzarella, Swiss cheese, and many other cheeses work well. Keep in mind that the flavor, texture, and sodium content may vary.

Nutrition Information

Estimated nutrition per serving (1/8 of the casserole):

• Calories: 421 kcal
• Protein: 24.1 g
• Total Fat: 27.1 g
• Saturated Fat: 11.6 g
• Carbohydrates: 19.3 g
• Dietary Fiber: 1.4 g
• Cholesterol: 251 mg
• Sodium: 990 mg

These values are estimates based on the listed ingredient weights and standard nutrition data. Actual nutrition may vary depending on the brands and specific ingredients used, particularly the breakfast sausage, bread, milk, and cheddar cheese.

Final Thoughts

This Easy Breakfast Egg Casserole Recipe is a practical way to serve a warm, satisfying breakfast without spending the whole morning in the kitchen. With eggs, sausage, cheddar cheese, bread, and vegetables, it is easy to prepare, customize, and serve to family or guests.

Prepare it the night before for a convenient morning meal, or bake it fresh for a weekend brunch. For another easy meal idea, try our Easy Cuban Chicken and Rice Recipe for a flavorful one-pan dinner. Once you know the basic method, you can experiment with different cheeses, vegetables, and seasonings to make the recipe your own.

Enjoy your homemade breakfast egg casserole!