Preheat your oven to 350°F (175°C).
In a large bowl, beat the eggs and milk together until well combined.
Add in the diced bell peppers, onions, and any optional meats.
Stir in the shredded cheese, garlic powder, oregano, salt, and pepper.
Grease a baking dish with cooking spray or butter.
Pour the egg mixture into the prepared baking dish.
Bake in the preheated oven for 30-35 minutes, or until the center is set.
Check for doneness by inserting a knife into the center; it should come out clean.
Remove from the oven and let it cool for a few minutes.
Garnish with fresh parsley before serving.