01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and black pepper.
02 - Heat olive oil in a large skillet over medium-high heat. Add chicken breasts and sear for 3 to 4 minutes per side until golden brown. Remove chicken from pan and set aside on a plate.
03 - In the same pan, add red onion slices. Sauté for 2 minutes until slightly softened. Add minced garlic and cook for 30 seconds until fragrant, stirring constantly.
04 - Stir in cherry tomatoes and cook for 3 to 4 minutes until they begin to release their juices and soften slightly.
05 - In a small bowl, whisk together balsamic vinegar, chicken broth, and honey until well combined. Pour mixture into the pan, scraping up any browned bits from the bottom with a wooden spoon.
06 - Return chicken breasts to the skillet, nestling them among the vegetables. Sprinkle with thyme and chopped basil. Reduce heat to low, cover, and simmer for 12 to 15 minutes until chicken is cooked through (internal temperature reaches 165°F).
07 - Remove lid and continue simmering uncovered for 2 to 3 minutes to allow sauce to reduce and thicken slightly.
08 - Transfer chicken to serving plates. Spoon pan sauce and vegetables over the chicken. Garnish with additional fresh basil leaves if desired.