01 - Pat the chicken breasts dry with paper towels and 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 5–6 minutes per side until golden brown and cooked through, reaching an internal temperature of 165°F. Remove chicken from the skillet and set aside on a plate, tented loosely with foil to keep warm.
03 - Reduce heat to medium. Add the chopped shallot to the same skillet and sauté for approximately 2 minutes until softened and fragrant.
04 - Add blueberries, fresh thyme leaves, chicken broth, balsamic vinegar, and honey to the skillet. Simmer for 5–7 minutes, stirring occasionally, until blueberries burst and the sauce reduces slightly.
05 - Stir in the unsalted butter until melted and the sauce becomes smooth and glossy.
06 - Return the chicken breasts to the skillet, turning to coat thoroughly with the blueberry-thyme sauce. Simmer for 1–2 minutes to heat through. Serve immediately, topped with additional sauce and fresh thyme sprigs for garnish.