01 - Pat chicken breasts dry with 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 golden brown. Remove chicken from pan and set aside on a plate.
03 - In the same skillet, add red onion slices and sauté for 2 minutes until slightly softened. Add minced garlic and cook for 30 seconds until fragrant, being careful not to burn.
04 - Stir in halved cherry tomatoes and cook for 3 to 4 minutes until they start 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, using a wooden spoon to scrape up any browned bits from the bottom.
06 - Return the chicken breasts to the skillet, nestling them among the vegetables. Sprinkle thyme and chopped basil evenly over the top.
07 - Reduce heat to low, cover with a lid, and simmer for 12 to 15 minutes until chicken is cooked through and reaches an internal temperature of 165°F.
08 - Remove the lid and continue simmering uncovered for 2 to 3 minutes until the sauce reduces and thickens slightly.
09 - Transfer chicken to serving plates, spoon the pan sauce and vegetables over the top, and garnish with additional fresh basil leaves.