Step 1) Mix batter ingredients in a pre-sprayed 9-1/2-inch deep dish pie plate. Combine all topping ingredients EXCEPT roma tomato and mozzarella cheese in a mixing bowl.
Step 2) Top batter with chicken mixture, gently pushing topping into batter with the back of a spoon. Evenly distribute tomato slices and sprinkle with shredded cheese.
Step 3) Bake by placing in a COLD oven; set temperature to 350℉. Bake for 30 minutes or until done.