01 - Pat chicken breasts completely dry using paper towels. Season both sides generously with salt and black pepper, pressing the seasoning into the meat.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Add chicken breasts and sear for 3 to 4 minutes per side until deeply golden brown. Remove chicken from pan and set aside on a plate.
03 - In the same pan, add red onion slices and sauté for 2 minutes until slightly softened and translucent. Add minced garlic and cook for 30 seconds until fragrant, being careful not to burn it.
04 - Stir in halved cherry tomatoes and cook for 3 to 4 minutes until they begin to blister and release their juices.
05 - In a small bowl, whisk together balsamic vinegar, chicken broth, and honey until fully combined. Pour mixture into the pan, using a wooden spoon to scrape up any browned bits from the bottom.
06 - Return chicken breasts to the skillet, nestling them among the vegetables. Sprinkle thyme and chopped basil evenly over the dish. Reduce heat to low, cover with a tight-fitting lid, and simmer for 12 to 15 minutes until chicken reaches an internal temperature of 165°F.
07 - Remove the lid and continue simmering uncovered for 2 to 3 minutes until the sauce reduces and thickens slightly to a glaze consistency.
08 - Transfer chicken to serving plates. Spoon the pan sauce and vegetables over the chicken. Garnish with additional fresh basil leaves and serve immediately.