Preheat your oven to 375°F (190°C) and gather all your ingredients.
Pat chicken breasts dry and season both sides with salt and pepper.
In a medium saucepan, combine blueberries, balsamic vinegar, honey, and fresh thyme over medium heat. Smash blueberries with a fork as they cook for about 5 minutes.
Heat olive oil in an oven-safe skillet over medium-high heat. Sear chicken breasts for 2-3 minutes per side until golden brown.
Pour the blueberry sauce over the seared chicken in the skillet.
Transfer skillet to the preheated oven and bake for 20-25 minutes until chicken reaches an internal temperature of 165°F (74°C).
Let rest for about 3 minutes before serving. Drizzle extra sauce on top and garnish with fresh thyme.