Spray large nonstick skillet with nonstick cooking spray. Heat over medium-high heat until hot. Sprinkle both sides of chicken breast halves with Italian seasoning. Place chicken in skillet; cook about 5 minutes on each side or until lightly browned.
Add pasta sauce; bring to a boil. Reduce heat to medium; cover and cook 5 to 6 minutes or until chicken is no longer pink in center.
Sprinkle cheese over chicken; cover and cook 1 minute or until cheese is melted.
Place 1 slice of toasted bread on each of 4 plates. Top each with 1/4 of sauce and 1 chicken breast half.