Place hash browns in a single layer in greased 9X13 baking dish. Preheat oven to 450°F. Bake 20 minutes or until brown, turning hash browns after 10 minutes. Remove from oven and let stand 5 minutes.

Reduce oven to 350°F.

Beat eggs in a large bowl with whisk. Add milk, sour cream, garlic powder, mustard, & pepper. Mix well. Stir in bacon, 1 1/2 cups of cheese, & onions. Pour over hash browns. Sprinkle with remaining 1/2 cup cheese.

Bake 40-50 minutes or until center is set and the edges are golden brown.