Preheat your oven to 400°F (200°C) and line a pizza pan with parchment paper.

In a mixing bowl, combine shredded mozzarella and cheddar cheese until well-blended.

Spread the cheese mixture onto the prepared parchment paper in a circular shape, about ¼ inch thick.

Bake for approximately 5 minutes until the edges are golden and the cheese is bubbly.

Arrange the cooked chicken, bell pepper, diced tomato, and green onion over one half of the cheese shell.

Fold the cheese shell over the filling and bake for an additional 4-5 minutes.

Remove from the oven and serve hot with your favorite sides like sour cream, salsa, or guacamole.