This hearty breakfast casserole is perfect for feeding a crowd with minimal effort. It's low carb and keto friendly, making it a great way to start your day.
Preheat oven to 375F and grease a 9x13 baking dish with butter.
Brown the breakfast sausage in a large skillet over medium-high heat, breaking it into crumbles, about 6-7 minutes. Add diced onion and bell pepper in the last 3 minutes and cook until softened.
Drain any excess grease and spread the sausage mixture evenly in the baking dish.
In a large bowl, whisk together eggs, heavy cream, salt, pepper, and garlic powder until smooth and fully blended.
Sprinkle 1 cup cheddar and the mozzarella over the sausage layer, then pour the egg mixture evenly on top.
Top with the remaining 1 cup cheddar cheese.
Bake for 35-40 minutes until set in the center and golden on top. Rest 10 minutes, sprinkle with chives, and slice.