1. Heat large nonstick skillet over medium heat until hot.
2. Spray one side of one flour tortilla with cooking spray; place, sprayed side down, in skillet. Top with cheese, chicken, green onion and salsa. Place remaining tortilla over mixture; spray with cooking spray.
3. Cook 2 to 3 minutes per side or until golden brown and cheese is melted. Cut into 8 triangles.
Variation
For bean quesadillas, omit the chicken and spread 1/3 cup canned fat-free refried beans over one of the tortillas.