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Preheat the Oven:
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Set your oven to 375°F (190°C) and allow it to come up to temperature.
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Cook the Sausage and Vegetables:
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In a large skillet over medium heat, cook the ground sausage until it is browned and completely cooked through. Add the finely chopped onion and diced red bell pepper to the skillet, and sauté them for about 5 minutes until the vegetables have softened.
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Prepare the Egg Mixture:
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In a separate large bowl, whisk together the eggs, milk, salt, and pepper until the mixture is smooth and well combined.
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Assemble the Casserole:
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Spread the thawed hash browns evenly across the bottom of a greased 9×13-inch baking dish.
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Evenly layer the cooked sausage and vegetable mixture over the hash browns.
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Sprinkle half of the shredded cheddar cheese over the sausage and vegetables.
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Add the Egg Mixture and Cheese Topping:
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Pour the egg mixture evenly over the entire dish. Then, top with the remaining cheddar cheese.
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Bake:
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Place the dish in the preheated oven and bake for 35-40 minutes. The casserole is ready when the eggs are set and the cheese on top is melted and bubbly.
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Garnish and Serve:
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Remove from the oven and let cool for a few minutes. If desired, sprinkle with chopped fresh parsley before serving.
