Preheat oven to 350°F.
Grease a pie plate or an 11 X 7 inch casserole dish.
In a large bowl, beat eggs.
Add green chiles, cheddar and Monterey jack cheeses, flour, baking powder and milk.
Stir until combined.
Pour egg mixture into prepared pie plate or casserole dish.
Bake in a preheated oven 50 minutes or until set.
Remove from oven, let sit 5 minutes, cut into squares and serve.
Garnish with salsa and/or sour cream, if desired.