- 2 teaspoons vegetable oil
- 1 medium yellow onion, thinly sliced
- 1 (12–14″) soft loaf French or Italian bread, split in half lengthwise
- 1 garlic clove, smashed
- 2 cups shredded rotisserie chicken
- 1/2 cup plus 2 tablespoons barbecue sauce, divided
- 3/4 cup coarsely grated smoked mozzarella (about 3 ounces)
- 3 tablespoons coarsely chopped fresh cilantro
- Position rack in top third of oven and preheat to 425°F. Heat oil over low in a medium skillet. Cook onion, stirring occasionally, until soft and translucent, about 10 minutes. Set aside.
- Place bread, cut side up, on a rimmed baking sheet and bake 5 minutes. Remove from oven and rub cut sides with garlic.
- Toss chicken with 1/4 cup barbecue sauce in a medium bowl. Spread remaining 6 Tbsp. sauce on cut sides of bread. Layer reserved onions on sauce, then top with chicken mixture and mozzarella.
- Bake until cheese is melted and golden brown, about 10 minutes. Top with cilantro.