In large skillet, heat oil over medium heat. Add onions; salt and pepper to taste. Sauté until onions are golden brown (about 4-5 minutes). Add in chicken and barbecue sauce; heat through.
Place Naan on baking sheet. Spread chicken mixture over crust. Top with cheese.
Bake in a preheated 425°F oven 10 minutes or until cheese is melted and bubbly.