Place chicken breast halves between 2 sheets of plastic wrap; pound to 1/2-inch thickness. Sprinkle chicken with salt and pepper. Heat a large skillet over medium-high heat. Add olive oil to pan. Add chicken; sauté for 3 minutes on each side or until done. Transfer to a serving platter. Add coarsely chopped garlic cloves to pan; sauté for 1 minute, stirring constantly. Stir in cherry tomatoes and chicken broth, and bring to a boil. Cook 5 minutes, stirring occasionally. Spoon over chicken. Garnish with small basil leaves.