Preheat oven to 450*. Cut chicken tenders into bite size pieces. Coat medium nonstick skillet with nonstick cooking spray; cook and stir chicken oven medium heat 2 minutes. Add onion and pesto; cook and stir about 3 minutes or until chicken is cooked through.
Arrange tomato slices and chicken mixture on pizza crust to within 1 inch of edge. Sprinkle cheese over topping. Bake 8 minutes or until pizza is hot and cheese is melted and bubbly.