Brown the breakfast sausage in your large sauté pan. Use a spatula to break the meat into small pieces. Cook until it is golden and no longer pink.

Grease your large casserole dish with butter or oil. Place the cubes of sourdough bread into the bottom. This creates a soft and very tasty bread base.

Whisk your eggs and whole milk in a bowl. Add the salt, pepper, and chopped bell peppers now. Stir them together until the mixture is very smooth.

Spread the cooked sausage over the bread cubes evenly. Pour the egg mixture over everything in the dish. Let it sit for ten minutes to soak in.

Sprinkle a thick layer of cheddar cheese on top. Add the green onions for a fresh and bright look. This ensures every bite is cheesy and very savory.

Place the dish in a preheated hot oven today. Bake until the center is firm and the cheese bubbles. Serve it warm for a very professional family breakfast.