Preheat oven to 375 degree F. In a medium bowl stir together the tomatoes, chicken, pizza sauce, and mushrooms. Spoon mixture into four greased 12- to 16-ounce individual baking dishes. Sprinkle the pizza cheese evenly over tomato mixture. Sprinkle with Parmesan cheese.
Unroll the breadstick dough. Separate along perforations to form 12 strips. Weave strips over filling to form a lattice crust on each baking dish. Depending on the width of your bowls, you may need to cut strips to length or piece strips together.
Brush dough with a little milk. Sprinkle with remaining tablespoon of Parmesan cheese. Bake for 25 minutes or until breadsticks are golden brown and filling is bubbly. Cool 5 minutes. Serve in dishes or loosen edges and invert onto dinner plates; remove dishes. Sprinkle with desired toppings. Makes 4 servings.