Roll the puff pastry out into 2 large rectangles and slice into 8 triangles each (leaving you with 16 triangles overall).
Arrange the triangles in a circle, overlapping each one slightly to ensure the filling will be well wrapped. Spread some pizza sauce around the ring (reserving some for the topping), then top with pepperoni, mozzarella, red pepper, basil, and oregano to form a circle of ingredients.
Fold the corners of the triangles into the centre of the ring one at a time. Press down into the bottom of the pastry to lightly seal.
Brush the whole ring with the whisked egg then drizzle with more pizza sauce and grated cheddar.
Bake for 25 minutes until golden and well risen. Pour the remaining topping over the ring along with some more cheese.
Return to the oven for 10 minutes then serve with Ranch dressing.