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Best-Ever Easy Overnight Breakfast Casserole
This overnight breakfast casserole is a comforting, satisfying way to start the day. With tender bread, fluffy eggs, melted cheese, savory ham or sausage, and colorful vegetables, it comes together the night before and bakes into a warm, crowd-pleasing breakfast.
Quick Overview
- Prep Time: Not provided
- Cook Time: Not provided
- Total Time: Not provided
- Servings: Not provided
Why Make This Recipe
- Easy preparation: Assemble the casserole the night before, then bake it in the morning.
- Great for groups: A 9×13 inch baking dish makes this a practical choice for family breakfasts, brunches, and holidays.
- Flexible ingredients: Use diced ham or sausage, your favorite shredded cheese, and vegetables such as bell peppers and onions.
- Comforting flavor: Soft bread, creamy eggs, savory meat, and melted cheese create a hearty breakfast in every serving.
Ingredients
- 6 slices of bread
- 8 large eggs
- 2 cups milk
- 1 cup shredded cheese
- 1 cup diced ham or sausage
- 1 cup chopped vegetables (like bell peppers and onions)
- Salt and pepper to taste
- 1 tsp mustard (optional)
How to Make It
Grease a 9×13 inch baking dish. Coat the dish evenly so the casserole is easier to serve after baking.
Tear the bread into pieces and spread evenly in the dish. Arrange the bread across the bottom so it forms an even base for the egg mixture.
In a bowl, whisk together eggs, milk, salt, pepper, and mustard (if using). Whisk until the eggs and milk are well combined and the seasonings are distributed throughout.
Pour the egg mixture over the bread. Pour slowly and evenly so the bread can absorb the liquid.
Sprinkle cheese, ham or sausage, and vegetables on top. Distribute each topping across the casserole for balanced flavor in every portion.
Cover and refrigerate overnight. Chilling allows the bread to absorb the egg mixture and makes the casserole convenient to prepare ahead.
Preheat oven to 350°F (175°C). Heat the oven fully before baking the casserole.
Bake uncovered for 45-55 minutes until set and lightly browned. The center should be set, and the top should have a light golden-brown color.
Let cool slightly before serving. Allowing the casserole to cool briefly helps it settle and makes serving easier.
How to Serve It
- Serve warm with fresh fruit, berries, or a simple fruit salad for a refreshing contrast.
- Add a green salad or roasted vegetables for a balanced brunch plate.
- Garnish with chopped fresh herbs, sliced green onions, or a little extra shredded cheese.
How to Store It
Let leftover casserole cool, then cover it and store it in the refrigerator. Reheat individual portions until warmed through, taking care not to overheat them so the eggs do not become dry.
For longer storage, place cooled portions in a freezer-safe container and freeze them. Thaw frozen portions in the refrigerator before reheating. Reheat gently until hot throughout.
Helpful Tips
- Use bread that is slightly stale or dry, since it absorbs the egg mixture without becoming overly soft.
- Spread the bread, meat, vegetables, and cheese evenly so each serving contains a good balance of ingredients.
- Check the casserole near the end of the 45-55 minute baking range, as ovens and baking dishes can vary.
Optional Variations
- Replace the ham or sausage with cooked bacon, diced turkey, or another preferred breakfast meat.
- Try different cheeses, such as cheddar, Monterey Jack, or Swiss, for a new flavor.
- Add other chopped vegetables, such as spinach, mushrooms, or tomatoes, while keeping the vegetables well drained to prevent excess moisture.
Frequently Asked Questions
Can I prepare this casserole without mustard?
Yes. The mustard is optional and can be left out without changing the basic preparation.
Can I use ham and sausage together?
Yes. You can combine them if you prefer a more varied savory flavor, keeping the overall amount of meat appropriate for the casserole.
Why does the casserole need to refrigerate overnight?
The overnight rest allows the bread to absorb the egg and milk mixture, creating a cohesive, tender texture when baked.
How do I know when the casserole is done?
It is ready when the center is set and the top is lightly browned after baking uncovered for 45-55 minutes.
Can I add different vegetables?
Yes. Bell peppers and onions are suggested options, but other chopped vegetables can also work when prepared in small pieces and not overly wet.
Overnight Breakfast Casserole
This overnight breakfast casserole is a comforting dish featuring tender bread, fluffy eggs, melted cheese, savory ham or sausage, and colorful vegetables, perfect for a crowd.
Ingredients
Main Ingredients
- 6 slices slices of bread Use slightly stale or dry bread for best results.
- 8 large eggs
- 2 cups milk
- 1 cup shredded cheese Try cheddar, Monterey Jack, or Swiss for different flavors.
- 1 cup diced ham or sausage You can combine ham and sausage if desired.
- 1 cup chopped vegetables (like bell peppers and onions) Other vegetables like spinach or mushrooms can also be used.
- Salt and pepper to taste
- 1 tsp mustard (optional) Can be omitted if not desired.
Instructions
Preparation
- Grease a 9x13 inch baking dish evenly to facilitate serving.
- Tear the bread into pieces and spread them evenly in the dish.
- In a bowl, whisk together the eggs, milk, salt, pepper, and mustard (if using) until well combined.
- Pour the egg mixture over the bread slowly and evenly to allow absorption.
- Sprinkle cheese, ham or sausage, and vegetables on top, distributing for even flavor.
- Cover and refrigerate overnight.
Cooking
- Preheat the oven to 350°F (175°C).
- Bake uncovered for 45-55 minutes until the center is set and the top is lightly browned.
- Let cool slightly before serving.
Notes
Serve warm with fresh fruit or a simple salad. Store leftovers in the refrigerator, or freeze for longer storage. Reheat gently to avoid drying out the eggs.
