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 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 loosely 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 it.
04 - Add zucchini slices to the skillet and cook for 3–4 minutes, stirring occasionally, until just tender and beginning to develop light golden edges.
05 - Stir in cherry tomatoes and red pepper flakes if using. Continue cooking for another 2–3 minutes until tomatoes start to soften and release their juices.
06 - Return the cooked chicken to the skillet, nestling the pieces among the vegetables. Allow everything to heat through for about 1 minute.
07 - Arrange sliced mozzarella over each chicken breast. Cover the skillet with a lid and cook for 2–3 minutes until the cheese is fully melted and bubbly.
08 - Remove from heat. Drizzle with balsamic glaze, scatter torn basil leaves over the top, and serve immediately while hot.