1. Preheat the oven to 220 degrees Celsius.

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

3. In a pan, cook the chicken until it is cooked through.

4. Dice the onion and sauté in the same pan until translucent.

5. Add the canned tomatoes and simmer until the sauce thickens.

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

7. Spread the tomato sauce evenly on the dough.

8. Top with the cooked chicken and diced onion.

9. Bake in the preheated oven for about 15-20 minutes, until the crust is crispy.

10. Remove from the oven, slice into pieces, and serve.