01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, and dried Italian herbs, pressing the seasoning into the meat to adhere.
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 the remaining tablespoon of olive oil to the same skillet. Add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn.
04 - Add zucchini slices to the skillet and cook for 3–4 minutes, stirring occasionally, until just tender-crisp and lightly golden.
05 - Stir in 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 it among the vegetables. Arrange sliced mozzarella over each chicken breast. Cover with lid and cook for 2–3 minutes until cheese is fully melted and bubbly.
07 - Remove from heat. Drizzle with balsamic glaze and scatter torn basil leaves over the top. Serve immediately while hot.