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 and sear for 5–6 minutes per side until golden brown and internal temperature reaches 165°F. Transfer chicken to a plate and cover loosely with foil to keep warm.
03 - Reduce heat to medium. Add chopped shallot to the same skillet and cook for 2 minutes, stirring occasionally, until softened and fragrant.
04 - Add blueberries, fresh thyme, chicken broth, balsamic vinegar, and honey to the skillet. Bring to a gentle simmer and cook for 5–7 minutes, allowing blueberries to burst and sauce to reduce slightly.
05 - Remove skillet from heat and stir in butter until melted and sauce becomes glossy and smooth.
06 - Return chicken to the skillet, spooning sauce over the top. Simmer for 1–2 minutes to heat through. Serve immediately topped with additional blueberry-thyme sauce and fresh thyme sprigs.