
Big brunch bakes always bring everyone together and this Grilled Cheese Sausage Egg Breakfast Casserole is a comfort food hero in my home. Layered with crunchy Texas toast, savory sausage, fluffy eggs, and gooey American cheese, it turns classic breakfast favorites into an easy bake everyone can share.
I started making this for holiday breakfasts and quickly realized how much my family looked forward to it. Now it is our go-to whenever there is a crowd and I love how easy it is to prep the night before.
Ingredients
- Pork breakfast sausage: adds savory flavor and pairs perfectly with eggs. Try to find sausage that is freshly ground and has no unnecessary fillers
- Large eggs: create rich texture and help the casserole set beautifully. Opt for eggs with bright yolks for best flavor
- Butter: gives the bread delicious crispness. Good quality unsalted butter makes a difference in the final taste
- Whole milk: ensures a super creamy custard. Use full-fat milk if possible for the right mouthfeel
- Kosher salt and coarse black pepper: highlight the savory flavors and keep things balanced. Fresh cracked pepper is best
- Ground mustard: provides subtle brightness that cuts through the richness
- Texas toast: offers thick slices that soak up the custard. Look for fresh bakery-cut bread for sturdier layers
- American cheese: melts smoothly giving you that classic grilled cheese stretch. Go for deli-sliced for easy layering
Step-by-Step Instructions
- Brown the Sausage:
- Cook pork breakfast sausage in a large skillet over medium-high heat. Use a wooden spoon to break it into crumbles as it cooks for four to five minutes until deeply browned. Transfer sausage to a plate lined with a paper towel to keep any excess fat out of the casserole
- Scramble the Eggs:
- Melt one tablespoon of butter in the same pan on medium heat. Crack ten eggs into a bowl whisk with a quarter cup of milk plus a pinch of salt and pepper until blended. Pour into the pan and gently stir until the eggs are just barely set and still a little creamy since they finish cooking in the oven
- Assemble the Base Layer:
- Spray a nine by thirteen baking dish with baking spray. Lay out six slices of Texas toast in one layer covering the bottom fully. Place a slice of American cheese on each bread slice for even cheese coverage
- Add Sausage and Eggs:
- Scatter the browned sausage over the bread and cheese then gently spoon the scrambled eggs on top. Layer another slice of cheese over the eggs to create classic grilled cheese richness
- Mix and Pour Custard:
- Whisk together the remaining eight eggs with three quarters cup of milk and the ground mustard until no streaks remain. Carefully pour this mixture over the assembled casserole so it soaks the bread evenly
- Top with Bread:
- Arrange the final slices of Texas toast across the top pressing down gently so they make a firm top crust
- Brush with Butter and Bake:
- Melt the remaining butter and brush it over the top bread slices. Cover the pan with foil and bake at three hundred seventy five degrees for twenty minutes then uncover and bake another twenty minutes so the top is crisp and golden

Nothing beats seeing that bubbly golden cheese and crisp top when it comes out of the oven. Watching my son go back for a third serving on his birthday morning was one of my favorite kitchen memories.
Storage Tips
Let the casserole cool completely before covering and refrigerating. It keeps well for up to four days. Reheat slices in the oven for best texture. For longer keeping wrap portions in foil freeze then reheat from thawed in a hot oven
Ingredient Substitutions
You can use turkey or chicken sausage for a lighter result. Cheddar or Monterey Jack cheese adds more tang and melt if you want to switch up the flavor. If you cannot find Texas toast use any sturdy thick bread like sourdough or French bread
Serving Suggestions
Pair this casserole with a fresh green salad or a bowl of fruit for a complete breakfast. Hot sauce and salsa are favorites on our table for anyone who likes a little spice. For a sweet note I sometimes serve berry jam and maple syrup on the side

Cultural Background
This breakfast bake combines beloved American staples grilled cheese and classic sausage and eggs in a way that honors diner comfort food. Sharing it at family gatherings or sleepovers makes ordinary mornings feel special
Commonly Asked Questions
- → Can I substitute a different type of bread?
Yes. Sourdough, French, or brioche can be used if Texas toast is not available. Choose sturdy, thick-cut bread for best results and texture.
- → Which cheese varieties work for this bake?
American cheese delivers smooth melt and classic flavor, but cheddar, Monterey Jack, or provolone are delicious alternatives for more variety.
- → How can I prepare this dish in advance?
Assemble the casserole the night before and refrigerate. Bake in the morning for a convenient, stress-free breakfast option.
- → Are there alternatives for pork sausage?
Yes, turkey sausage, vegetarian options, or even bacon can replace pork sausage, depending on your taste and dietary needs.
- → How do I prevent sogginess?
Use thick bread and avoid oversoaking. Finish baking uncovered so the top layer crisps for ideal texture and taste.
- → What sides pair well with this dish?
Fresh fruit, roasted potatoes, or a green salad complement the savory flavors and create a balanced breakfast plate.