Beat eggs, milk, and salt together in a large bowl until frothy. Stir in ham, cheese, chives, asparagus, and peas.Pour egg mixture into a greased 8-inch-square baking dish.Bake at 350 degrees for 45 minutes – 1 hour, or until eggs are cooked and omelet is set.Cut into squares and garnish with additional chives and fresh herbs, if desired.