1. Preheat the oven to 400 degrees F.

2. Add 1 tablespoon olive oil to large skillet. Heat over medium heat.

3. Add chicken pieces and saute until cooked through, no longer pink and juices run clear.

4. Spray a baking sheet or pizza pan with olive oil cooking spray.

5. Unroll dough, and press into the prepared pizza pan or baking sheet.

6. Bake dough 7 minutes in preheated oven, or until it begins to turn golden brown. Remove from oven.

7. Spread ranch dressing on pizza crust. Sprinkle with mozzarella cheese.

8. Arrange vine-ripened tomato slices, green onion, mushrooms, and cooked chicken pieces on top of cheese.

9. Top with cheddar cheese.

10. Return to the oven for 15 to 20 minutes, or until cheese is melted.