Preheat the oven to 325 degrees F (160 C).
Coat two 20 ounce individual oven safe baking dishes with non-stick spray. Click for 20 ounce oven safe baking dishes.
Dice the onion.
Pour the olive oil into a medium frying pan over medium heat and cook the ground beef and onion about 5 minutes. Drain off any excess grease from the beef.
Add the garlic, green chiles, cumin, oregano, and chili powder.
Sprinkle in salt and pepper to taste. Stir until well mixed.
Layer half of the beef mixture on the bottom of each of the dishes.
Next layer half of the cheese in each dish.
In a small bowl combine the egg and milk with a whisk.
Add the flour a little at a time to avoid lumps.
Pour half of the egg mixture over the top layer of cheese in each dish.
Sprinkle green onion, if using, over each dish.
Place the dishes on a baking sheet and bake for about 30 minutes. Click for a baking sheet.
Garnish with additional green onion if desired.