Preheat the broiler.

Toast the English muffins in the toaster until golden brown and crisp on top and bottom.

Arrange the muffins cut side up on a foil lined baking sheet. Spoon a generous tablespoon of pizza sauce over each muffin half. Top with the Mozzarella cheese and pepperoni. Sprinkle with Parmesan cheese and oregano.

Place the pizzas under the broiler for a few minutes, until the cheese is melted, bubbling and slightly golden. Serve warm.