Grilled Chicken Breasts with Tomato-Caper Sauce

Preheat grill to medium-high.

To prepare sauce: Heat 1 1/2 tsp. oil in a large skillet over medium heat. Add garlic and cook, stirring, until fragrant, 30 seconds to 1 minute. Stir in tomatoes, wine, capers, and 1/4 tsp. each salt and pepper; cook until the liquid has evaporated slightly, about 4 minutes. Stir in butter; cook, stirring, until the sauce has thickened slightly and the tomatoes are soft, 1 to 2 minutes. Remove from heat and stir in basil. Keep warm.

To prepare chicken: Place chicken between 2 sheets of plastic wrap; pound with a mallet to 1/2-inch thickness. Rub with oil and sprinkle with salt and pepper. Grill the chicken until an instant-read thermometer inserted in the thickest part registers 165 degrees F, 4 to 5 minutes per side. Serve the chicken with the sauce.