Fluffy Breakfast Egg Casserole with Sausage and Cheese Step-by-step instructions

Before you start

Before starting, ensure all ingredients are measured and ready. Preheat the oven to 375°F (190°C) so it reaches the correct temperature by the time the casserole is assembled. Dice the bell peppers into uniform pieces so they cook evenly.

Grate the cheddar cheese and slice the scallions. Lightly grease a 9x13-inch baking dish with nonstick cooking spray or a thin layer of butter to prevent the eggs from sticking to the sides during baking.

Instructions

Sautéing and Layering

1. 1Brown the Sausage
   Place a large skillet over medium-high heat. Add the ground breakfast sausage and cook, breaking it up with a spoon, until it is deeply browned and cooked through. The internal temperature of the sausage must reach 160°F (71°C) to ensure food safety. Drain any excess grease from the skillet.
   Look for The sausage should be completely browned with no pink remaining.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Use a wooden spoon or potato masher to break the sausage into small, uniform crumbles.
2. 2Layer the Base
   Lightly grease a 9x13-inch glass baking dish. Spread the browned breakfast sausage evenly across the bottom of the dish. Scatter the diced bell peppers uniformly over the sausage layer.
   Look for The sausage and peppers should cover the bottom of the dish evenly.
   Tip Ensure the sausage has cooled slightly before adding the peppers to maintain their crisp texture.

The breakfast sausage should be deeply browned with no pink remaining, releasing a savory, spiced aroma.

Once layered in the baking dish with the vibrant diced bell peppers, the base of the casserole should look colorful, evenly distributed, and ready for the liquid eggs.

Preparing and Pouring the Eggs

3. 3Whisk the Eggs
   In a large mixing bowl, crack the eggs. Whisk the mixture vigorously until the eggs are fully broken down, completely integrated, and slightly frothy on top.
   Look for The liquid should be uniform in color with no streaks of egg white remaining.
   Tip Whisking thoroughly incorporates air, which is essential for achieving a fluffy texture.
4. 4Assemble the Casserole
   Slowly pour the whisked egg mixture over the sausage and bell peppers in the baking dish, ensuring all ingredients are evenly submerged. Sprinkle the shredded cheddar cheese in an even layer across the top.
   Look for The cheese should form a complete, even blanket over the egg mixture.
   Tip Pour the eggs slowly from the side of the dish to avoid displacing the sausage and peppers.

The egg mixture should be pale yellow, thoroughly blended, and completely free of streaks. After pouring it over the base and topping it with shredded cheddar, the cheese should sit evenly on top of the liquid, completely covering the sausage and peppers beneath.

Baking and Serving

5. 5Bake the Casserole
   Place the baking dish in an oven preheated to 375°F (190°C). Bake for 35 to 40 minutes, or until the center is completely set and the cheese is melted, bubbling, and golden brown. To cook the eggs completely through, ensure the internal temperature reaches 160°F (71°C).
   Look for The edges should be slightly puffed, and the center should not jiggle when gently shaken.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If the cheese browns too quickly, cover the dish loosely with aluminum foil for the final 10 minutes.
6. 6Garnish and Serve
   Remove the casserole from the oven and immediately sprinkle the sliced scallions over the hot cheese. Let the casserole rest for 10 minutes to allow the custard to set. Slice into squares using a metal spatula and serve warm.
   Look for The scallions should stick to the warm, melted cheese.
   Tip Allowing the casserole to rest prevents the slices from falling apart when lifted.

The casserole should rise beautifully, with the edges slightly puffed and golden brown. The cheddar cheese on top should be completely melted, bubbling rapidly, and showing golden-brown spots. When gently shaken, the center should be firm and not jiggle.

Common mistakes

One common mistake is baking the casserole at too high a temperature, which causes the eggs to cook too quickly on the outside while remaining wet in the center. This leads to a rubbery texture and watery separation.

Another mistake is failing to drain the excess fat from the browned sausage before adding it to the baking dish. This excess grease will float to the top during baking, resulting in an oily layer on top of the melted cheese and a soggy custard base.

How to tell it’s done

To determine if the casserole is perfectly cooked, insert a knife or toothpick into the very center; it should come out clean without any wet egg clinging to it. The entire casserole should puff up slightly and feel firm to a gentle touch.

For safety, the internal temperature must be verified with an instant-read thermometer. The temperature of both the pork sausage and the eggs must reach at least 160°F (71°C) to ensure the dish is completely cooked and safe to serve.

• Ground meat: 160°F (71°C) in the thickest part
• Egg dishes: 160°F (71°C) in the thickest part