1. Preheat the oven to 200 degrees Celsius.

2. Cut the boneless chicken breast into small pieces and season with salt and pepper.

3. Heat olive oil in a pan and cook the chicken breast until it is cooked through.

4. Roll out the pizza dough and place it on a baking sheet.

5. Evenly distribute the diced tomatoes and onions on the pizza dough.

6. Also distribute the cooked chicken breast on the pizza dough.

7. Season with salt, pepper, and oregano.

8. Bake the pizza in the preheated oven for about 15-20 minutes, until the crust is crispy and the cheese is melted.

9. Remove from the oven and serve.