01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or aluminum foil.
02 - In a mixing bowl, lightly mash the fresh blackberries with a fork. Add softened cream cheese, 2 tbsp honey, diced jalapeño, lemon zest, and a pinch of salt. Stir until well combined and evenly incorporated.
03 - Pat the chicken breasts dry with paper towels. Using a sharp knife, cut a deep pocket into the thickest side of each breast, being careful not to slice all the way through.
04 - Generously fill each pocket with the blackberry cream cheese mixture, distributing it evenly among all four breasts.
05 - In a small bowl, whisk together olive oil, smoked paprika, garlic powder, 1/2 tsp salt, and black pepper. Brush the seasoning mixture evenly over the exterior of each stuffed chicken breast.
06 - Place the stuffed chicken breasts on the prepared baking sheet. Stir together 2 tbsp honey and balsamic vinegar, then brush the glaze generously over the top of each breast.
07 - Bake for 30–35 minutes until the chicken is cooked through with an internal temperature of 165°F and juices run clear when pierced.
08 - Remove from the oven and let rest for 5 minutes. Spoon any accumulated blackberry juices over the top before serving.