01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, pepper, and Italian herbs, pressing the seasoning into the meat.
02 - Heat 1 tablespoon olive oil in a large skillet over medium-high heat until shimmering. Add chicken breasts and cook for 5–6 minutes per side until golden brown and internal temperature reaches 165°F. Transfer to a plate and cover loosely with foil to keep warm.
03 - In the same skillet, add remaining tablespoon of olive oil. Add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn it.
04 - Add zucchini slices to the skillet and cook for 3–4 minutes, stirring occasionally, until just tender but still holding their shape.
05 - Add cherry tomatoes and red pepper flakes if using. Cook for another 2–3 minutes until tomatoes begin to soften and release their juices.
06 - Return chicken breasts to the skillet, nestling them among the vegetables. Arrange so each piece has contact with the pan bottom.
07 - Top each chicken breast with sliced mozzarella. Cover skillet with lid and cook for 2–3 minutes until cheese is fully melted and slightly bubbling.
08 - Remove from heat. Drizzle with balsamic glaze, sprinkle generously with fresh basil leaves, and serve immediately while hot.