How to Make It
Heat broiler. In a large skillet, heat the oil over medium-high heat. Season the chicken with ¾ teaspoon salt and ¼ teaspoon pepper and, working in batches, cook until cooked through, 2 to 3 minutes per side.
Dividing evenly, top the bread with the chicken, tomatoes, and mozzarella.
Place on a broilerproof baking sheet and broil until the cheese is melted, 3 to 5 minutes. Sprinkle with the basil.