Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish lightly with oil or butter. This prevents sticking and helps with easy serving later.

Heat a large skillet over medium heat. Add the sausage. Break it apart with a spoon. Cook until browned fully. Drain extra grease if needed.

In a large bowl, crack the eggs. Add milk, salt, pepper and garlic powder. Whisk well until smooth and slightly frothy. This creates a fluffy texture.

Spread thawed hash browns evenly in the greased baking dish. Press them down gently to form an even base layer across the bottom.

Sprinkle the cooked sausage evenly over the hash browns. Add shredded cheddar cheese on top. Spread it evenly for balanced flavor in every bite.

Slowly pour the egg mixture over the layered ingredients. Make sure the liquid spreads evenly across the dish. Gently shake the pan if needed.

Place the dish in the preheated oven. Bake for 40 to 45 minutes. The top should be golden. The center should be firm when touched lightly.

Remove from oven carefully. Let it rest for 10 minutes before cutting. This helps it set properly. Slice into squares and serve warm.