A delightful and hearty breakfast casserole perfect for starting your day with a burst of flavor.
Preheat your oven to 350°F (175°C).
Preheating ensures even cooking and a golden crust.
Cook the sausage in a skillet over medium heat until browned, then crumble it into small pieces.
Drain excess fat from the sausage for a lighter dish.
Spread the cooked sausage evenly in a greased 9x13 inch baking dish.
Ensure the sausage is evenly distributed for consistent flavor.
Sprinkle the diced onion and shredded cheddar cheese over the sausage.
Use freshly shredded cheese for better melting.
In a mixing bowl, whisk together the biscuit mix, salt, pepper, and eggs until smooth.
Mix until just combined to avoid overworking the batter.
Gradually add the milk to the mixture, stirring until well combined.
Adding milk slowly prevents lumps in the batter.
Pour the batter evenly over the sausage mixture in the baking dish.
Spread the batter gently to cover the sausage mixture completely.
Bake the casserole uncovered in the preheated oven for 35 minutes or until golden brown and set.
Check doneness by inserting a toothpick into the center; it should come out clean.
Let the casserole cool for 5 minutes before serving.
Allowing it to rest helps the flavors meld together.