Breakfast Lasagna With Hash Browns

Name: Breakfast Lasagna With Hash Browns
Ingredients: 1 bag/30 ounces frozen Southern Style hash browns or a 32-ounce bag shredded hash browns, thawed; salt and pepper; 3 cups shredded sharp cheddar cheese, divided; 3 tablespoons butter; 12 ounces thinly sliced Canadian bacon; 1 1/2 cups chopped onion; 1 large green bell pepper, chopped; 1 large yellow or red bell pepper, chopped; 8 ounces sliced mushrooms; 2 medium tomatoes, sliced, optional; 12 large eggs; 2 1/2 cup milk; 1/2 teaspoon salt; 1/4 teaspoon freshly ground black pepper