Preheat oven to 350.
Toss chicken in BBQ sauce (use more or less if desired). Cut your french bread in half length-wise and spread a thin layer of BBQ sauce on each piece of bread.
Top with about 1½ cups mozzarella cheese, and add BBQ chicken.
Turn to BROIL and cook for 3-5 minutes until cheese is melted and bubbly.
Once out, add cilantro, avocado and drizzle with ranch dressing.
Cut into slices and serve.