Best Breakfast Casserole Recipe with Sausage

Ingredients

• 1/2 cup butter, (1 stick)
• 1 (30-oz) package shredded hash brown potatoes, diced is ok, not my fav
• salt and pepper
• 1 pound breakfast sausage, bulk
• 1/2 green pepper, chopped
• 1/2 red pepper, chopped
• 1/2 small onion, diced
• 1 & 1/2 cups shredded Monterey Jack cheese, packed
• 1 & 1/2 cups shredded sharp cheddar cheese, packed
• 8 large eggs
• 1 & 1/3 cups half and half, cream, evaporated milk, or whole milk*
• 1 teaspoon seasoned salt
• 1/2 teaspoon kosher salt, 1/4 teaspoon if using table salt
• 1/2 teaspoon black pepper
• 1/4 teaspoon dry mustard, optional