Top 100 Five-Ingredient Dinners

I've been using this recipe pretty much as is for years. It is one of my families very favorite brunch dishes. I recently made it and another "standard" breakfast casserole for my husband's prayer group and it was the biggest hit ever! I'm so surprised this doesn't have more reviews - it's so easy to make. I even morphed it into a quiche recipe using large white corn tortillas for the crust. Try it - you'll love it!

What can I replace scallion with?