Beat 12 eggs until well blended.Next, beat in milk and garlic powder, mustard, 1 tsp salt & ½ tsp pepper. Set aside.Layer potatoes (I suggest to season each potato layer to taste.....a small pinch of salt and pepper) and sprinkle â…“ of the onions.Next sprinkle â…“ of the bacon.Last but not least, top with 1 cup of cheese.Repeat this layering 2 more times to have a total of 3 layers....ending with cheese.Take your egg mixture and pour over layers. For refrigerated hash browns, cook for 6-7 hours on low. For frozen hash browns, cook for 7-8 hours on low or until eggs are set.