Grease a 9 x 9-inch baking pan or an 11 x 7-inc pan.
In a bowl, whisk together eggs, flour and milk until smooth.
Stir in onion, butter, salt and cayenne.
Pour mixture into prepared baking pan.
In another small bowl, combine oregano, basil, garlic powder and tomato sauce; gently drizzle over the batter, and cut in with a knife to produce a marbled effect. (reserve a couple of tablespoons of sauce for the top of the pizza puff).
Sprinkle pepperoni or salami and the bell peppers and whatever else you would like to use such as mushrooms, onions etc over the sauce; dot with a little more sauce over the cheese (this is optional).