01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, and Italian herbs, pressing seasoning into 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 cover loosely with foil to keep warm.
03 - Add remaining 1 tablespoon olive oil to the same skillet. Add minced garlic and sauté for 30 seconds until fragrant, being careful not to burn.
04 - Add sliced zucchini to the skillet and cook for 3-4 minutes, stirring occasionally, until just tender and beginning to develop golden edges.
05 - Stir in cherry tomatoes and red pepper flakes if using. Cook for another 2-3 minutes until tomatoes start to soften and release their juices.
06 - Return chicken to the skillet, nestling pieces among the vegetables. Top each chicken breast with sliced mozzarella. Cover skillet with lid and cook for 2-3 minutes until cheese is completely melted and bubbly.
07 - Remove from heat. Drizzle with balsamic glaze in a zigzag pattern. Sprinkle torn fresh basil leaves over the top. Serve immediately while hot.