Wipe out skillet. Melt remaining 2 tablespoons butter in skillet over medium-high heat. Add chicken and salt; cook 4 to 6 minutes without moving, until chicken is browned and releases easily from pan. Stir; cook 3 to 5 minutes longer, stirring frequently, until chicken is cooked through. Stir in garlic, Italian seasoning and pepper flakes; cook and stir 30 seconds.