Before anything else, preheat your oven to 350°F (175°C). This is crucial, as a hot oven ensures that your casserole cooks evenly and gets that beautiful golden crust.

In a large skillet over medium heat, add the ground sausage. Cook it thoroughly, breaking it apart with a spatula as it cooks. The aim is to get it browned and crumbly. This should take about 6-8 minutes. When it’s done, drain excess grease.

While the sausage is cooking, chop your bell peppers and green onions. This step is simple, but it adds layers of flavor and color.

In a large mixing bowl, whisk together the eggs, sour cream, and milk. Add in the salt, pepper, smoked paprika, and garlic powder. Make sure it’s well combined and fluffy.

Once the sausage is ready, let it cool for a minute. Then, combine the cooked sausage, bell peppers, and green onions into the egg mixture, followed by the shredded cheese. Stir until everything is well coated.

Lightly grease a large baking dish, and pour the mixture in. Spread it out evenly, and pop it into your preheated oven. Bake for 35-40 minutes or until the top is lightly golden and a toothpick inserted in the center comes out clean.

Once baked, remove from the oven and allow it to sit for about 5 minutes before slicing. This helps everything set nicely. Serve warm and watch it disappear!