Loaded with bountiful veggies, this delicious egg bake has been winning raves for years and years! It's great for holiday brunches or make-ahead breakfasts.
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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.
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In a medium bowl, combine eggs, milk, parsley, salt, basil, and pepper. Whisk thoroughly to combine, then add remaining 1 cup of cheese and whisk again.
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Pour egg mixture evenly over other ingredients in baking pan. Cover with plastic wrap and refrigerate overnight.
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Bake casserole uncovered until egg in middle is just set and edges are lightly golden brown.