Tomato-Basil Chicken Bruschetta with Mozzarella

Bruschetta topping
4 To make the topping, combine [wprm-ingredient text="8 ounces halved cherry or grape tomatoes" uid="7"], [wprm-ingredient text="2 teaspoons red or white wine vinegar" uid="8"], [wprm-ingredient text="1 teaspoon finely chopped shallot" uid="9"], [wprm-ingredient text="1 teaspoon thinly sliced garlic" uid="14"], [wprm-ingredient text="2 tablespoons extra virgin olive oil" uid="12"], [wprm-ingredient text="½ teaspoon salt" uid="11"] and black pepper in a medium bowl and toss gently. 
7 Heat a medium (8-10 inch) skillet over medium heat until the surface is hot. Pour in the tomato mixture. Cook about 5 minutes, stirring occasionally, until the tomatoes are slightly softened and start to release their juices. Remove the pan from the heat, stir in [wprm-ingredient text="½ cup loosely packed fresh basil leaves" uid="15"] and set aside.
Grilled chicken
1 Put [wprm-ingredient text="4 boneless skinless chicken breasts" uid="1"] in a shallow baking dish. Combine [wprm-ingredient text="¼ cup fresh lemon juice" uid="17"], [wprm-ingredient text="2 tablespoons extra-virgin olive oil" uid="5"], [wprm-ingredient text="2 tablespoons chopped fresh herbs" uid="3"], [wprm-ingredient text="1 teaspoon grated or finely chopped fresh garlic" uid="4"], [wprm-ingredient text="1 teaspoon kosher salt" uid="18"], and [wprm-ingredient text="½ teaspoon crushed red pepper" uid="19"] in a bowl. Pour over the chicken, turning the pieces over to coat on both sides. Marinate 10-15 minutes at room temperature, or refrigerate up to 4 hours ahead.
0 Heat a gas grill to medium-high or prepare a charcoal grill for direct medium-hot grilling, or preheat your broiler to high.
2 When the grill is ready, cook the chicken until browned on both sides and cooked through, about 5 minutes per side. If you're broiling, arrange the chicken on a rack set over a broiler pan. Broil about 4 minutes per side. Transfer to a platter and immediately layer slices of mozzarella over the chicken. The cheese will soften and melt in minutes.
3 Spoon some of the bruschetta sauce over the chicken. Serve warm or at room temperature, with additional sauce on the side.