01 - Pat chicken breasts dry with paper towels and 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 3-4 minutes per side until golden brown. Remove chicken from pan and set aside on a plate.
03 - In the same pan, add red onion and sauté for 2 minutes until slightly softened. Add garlic and cook for 30 seconds until fragrant, stirring constantly to prevent burning.
04 - Stir in cherry tomatoes and cook for 3-4 minutes until they start to release 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 the chicken breasts to the skillet, nestling them among the vegetables. Sprinkle with thyme and chopped basil. Reduce heat to low, cover, and simmer for 12-15 minutes, or until chicken reaches an internal temperature of 165°F.
07 - Remove the lid and continue simmering uncovered for 2-3 minutes to allow the sauce to reduce and thicken slightly.
08 - Transfer chicken to plates, spoon the pan sauce and vegetables over the top, and garnish with additional fresh basil leaves if desired.