Line a quarter sheet baking pan with parchment and pour the eggs into it. Bake for approximately 20 minutes. Note that you can also bake the bacon in a second pan. I line mine with parchment and bake for 12 minutes, then turn every 2 minutes until done. Cooking time will depend on the thickness of your baking pan.
On one half of the eggs layer, layer on 3 pieces of cheddar, all the bacon, chopped asparagus, half of the green onion and 3 more slices of cheddar.
Cover that with the other half of the baked egg layer. Top with the last 3 pieces of cheddar and the remaining green onion. Bake for about 10-20 minutes or until the cheese is nicely melted.
Cool slightly and serve.