Place slices of plum tomato, green tomato, onion, and apple on a 15- x 10- x 1-inch jellyroll pan coated with cooking spray; coat vegetables and apple with cooking spray. Bake at 500° for 10 minutes. Remove from oven; set aside. Reduce oven temperature to 425°.
Unroll pizza dough onto a baking sheet coated with cooking spray. Pat dough into a 15- x 12-inch rectangle. Bake at 425° for 5 minutes. Top with hot pepper cheese strips; set aside.
Set roasted plum tomato slices aside. Chop green tomato, onion, and apple; combine in a small bowl. Press gently with paper towels to remove excess moisture. Add chiles and garlic, stirring well.
Top hot pepper cheese strips with green tomato mixture; sprinkle with pepper. Top with roasted plum tomato slices and mozzarella. Bake at 425° for 10 minutes or until cheese melts. Serve immediately.