Preheat your oven to 375 degrees F. Spray an 8x8-inch baking dish with cooking spray.
In a large bowl, whisk together the eggs, skim milk, garlic powder, salt, and pepper.
Stir in the diced ham, bell pepper, onion, and Swiss cheese.
Pour the mixture into the prepared baking dish.
Bake for 25-30 minutes, or until the center is fully set.
Let cool for 5 minutes before slicing into 4 servings.