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 seasoned chicken breasts and cook for 5 to 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.
04 - Add zucchini rounds to the skillet. Cook for 3 to 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 2 to 3 minutes until tomatoes start to soften and release their juices.
06 - Return chicken breasts to the skillet, nestling them among the vegetables. Arrange sliced mozzarella over each piece of chicken. Cover with lid and cook for 2 to 3 minutes until cheese is completely melted and bubbly.
07 - Remove from heat. Drizzle balsamic glaze over the skillet, then scatter torn fresh basil leaves across the dish. Serve immediately while hot.