01 - Pat the chicken breasts dry with paper towels and season both sides generously with salt and pepper.
02 - Heat olive oil in a large skillet over medium-high heat. Sear chicken breasts for 5-6 minutes per side until golden brown and cooked through, reaching an internal temperature of 165°F. Transfer to a plate and tent loosely with foil to keep warm.
03 - Reduce heat to medium. Add chopped shallot to the same skillet and sauté for 2 minutes until softened and fragrant.
04 - Add blueberries, thyme leaves, chicken broth, balsamic vinegar, and honey to the skillet. Simmer for 5-7 minutes, stirring occasionally, until blueberries burst and sauce reduces slightly.
05 - Remove skillet from heat and stir in butter until melted and incorporated, creating a smooth, glossy sauce.
06 - Return chicken to the skillet, turning to coat evenly with the blueberry-thyme sauce. Simmer for 1-2 minutes to warm through. Serve immediately with extra sauce spooned over top and garnish with fresh thyme sprigs.