01 - Season both sides of each chicken breast thoroughly with salt and black pepper, ensuring even coverage.
02 - Heat olive oil in a large skillet over medium-high heat. Place chicken in the pan and sear for 4 to 5 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Transfer to a plate and cover loosely with foil to maintain warmth.
03 - Reduce heat to medium. Add minced garlic to the same skillet and sauté for 30 seconds until fragrant, being careful not to burn.
04 - Pour in heavy cream and chicken broth, stirring continuously to incorporate. Add dried Italian herbs and red pepper flakes if using. Bring the mixture to a gentle simmer.
05 - Stir in grated Parmesan cheese until fully melted and the sauce achieves a smooth, velvety consistency.
06 - Add baby spinach and halved cherry tomatoes to the sauce. Cook for 2 to 3 minutes until spinach is completely wilted and tomatoes begin to soften slightly.
07 - Return chicken breasts to the skillet, spooning sauce and vegetables generously over each piece. Simmer for an additional 2 to 3 minutes until heated through. Serve immediately, optionally garnished with additional Parmesan and fresh herbs.