01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt and freshly ground black pepper.
02 - Heat olive oil in a large skillet over medium-high heat. Sear chicken breasts for 5 to 6 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Transfer chicken to a plate and tent loosely with foil to keep warm.
03 - Reduce heat to medium. Add chopped shallot to the 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 to 7 minutes until blueberries burst and sauce reduces slightly.
05 - Stir in butter until melted and sauce becomes smooth and glossy.
06 - Return chicken to the skillet, turning to coat thoroughly with blueberry-thyme sauce. Simmer for 1 to 2 minutes. Serve chicken topped with additional sauce and fresh thyme sprigs.