Step 1

Spray a 3-4 quart casserole dish with nonstick cooking spray. If baking immediately, preheat the oven to 350.

Step 2

Brown the sausage in a large skillet over medium-high heat until it is no longer pink. Drain off excess grease. Season with salt and pepper.

Step 3

Whisk the eggs in a large bowl. Add the milk, sour cream, Dijon, salt, and black pepper, and whisk until combined.

Step 4

Place the cooked sausage in the casserole dish. Add the diced red pepper, sliced green onions, and 1 cup of cheese.Evenly pour the egg mixture on top.

Step 5

If making ahead: Store the unbaked casserole covered in the refrigerator for up to 24 hours. The next day, let it sit at room temperature for 30 minutes before baking.

Step 6

Bake for 40-45 minutes or until the center is just about set. Be careful not to overbake or it can become tough. Add the remaining 1 cup of cheese in an even layer and bake for 5 more minutes or until the cheese is melted. Let it cool for 5-10 minutes, then serve.