01 - Preheat oven to 400°F.
02 - Cut a pocket into each chicken breast without slicing through.
03 - Drizzle olive oil on chicken breasts and season both sides with salt, pepper, and Italian seasoning.
04 - Fill each breast with 2–3 mozzarella slices, tomato slices, and 4 basil leaves; secure with toothpicks if needed.
05 - Heat an oven-safe skillet over medium-high heat and sear stuffed breasts 2–3 minutes per side until golden.
06 - Transfer skillet to oven and bake 18–22 minutes until chicken is cooked through and cheese melts.
07 - Simmer balsamic vinegar and honey in a small saucepan over medium heat until reduced by half and syrupy, about 8–10 minutes.
08 - Remove toothpicks from chicken and drizzle with balsamic glaze before serving.