Preheat oven to 350 degrees and prepare a 9x13 pan, by spraying with non-stick spray, set aside.
In a large mixing bowl, whisk together the 2 ½ cups of egg beaters and 9 large eggs together with with cooled melted butter.
Whisk the bisquick and salt and pepper into the egg mixture, there will be some lumps, that is ok. (That makes it fluffy)
Pour ½ the egg mixture into your 9x13 pan, then add in the ham, green pepper, onion, tomatoes, mushrooms then add the cheese on top of the vegetables and ham.
Pour the remainder of the egg mixture on top of everything.
Bake for 1 hour and 10 minutes or until firm.
Let breakfast bake sit for 5 minutes before serving.