Step 1 : In a large non-stick skillet over medium heat, cook sausage, onions, mushrooms, and garlic until sausage is no longer pink and mushrooms have given off some of their liquid.
Step 2 : In a medium bowl, combine eggs, milk, parsley, salt, basil, and pepper. then add remaining cup of cheese and whisk again. Pour egg mixture evenly over other ingredients in baking pan.