Preheat oven to 400Â°F.
Melt butter and pour 1/4 cup or half into the bottom of a 9x13 baking dish
Beat eggs and egg whites in a large bowl or mixer.
Stir in flour, baking powder, chiles with juice, all cheeses, salt, and pepper.
Pour egg mixture into baking pan.
Pour remaining butter evenly over the top.
Bake for 15 minutes. Reduce heat to 350Â°F and bake 35 to 40 minutes or until casserole is set.