01 - Pat the chicken breasts thoroughly dry with paper towels. Season both sides generously with salt and freshly ground 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 5–6 minutes per side until golden brown and cooked through, reaching an internal temperature of 165°F. Transfer chicken to a plate and tent loosely with foil to rest.
03 - Reduce heat to medium. Add finely chopped shallot to the same skillet and sauté for 2 minutes until softened and fragrant, scraping up any browned bits from the bottom.
04 - Add blueberries, thyme leaves, chicken broth, balsamic vinegar, and honey to the skillet. Stir to combine and bring to a gentle simmer. Cook for 5–7 minutes until blueberries burst and the sauce reduces slightly, thickening to a syrup-like consistency.
05 - Remove skillet from heat and stir in butter until melted and incorporated, creating a smooth, glossy sauce.
06 - Return chicken breasts to the skillet, turning to coat thoroughly in the blueberry-thyme sauce. Simmer for 1–2 minutes to warm through. Serve immediately with extra sauce spooned over the top and fresh thyme sprigs as garnish.