01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black 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 tent with foil to keep warm.
03 - Add remaining tablespoon of olive oil to the same skillet. Add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn it.
04 - Add sliced zucchini to the skillet and cook for 3–4 minutes, stirring occasionally, until just tender and lightly browned.
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 to the skillet, nestling the breasts among the vegetables.
07 - Top each chicken breast with sliced mozzarella. Cover skillet with lid and cook for 2–3 minutes until cheese is fully melted and bubbly.
08 - Remove from heat. Drizzle with balsamic glaze and sprinkle with torn fresh basil leaves. Serve immediately while hot.