Heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add chicken breast tenders to pan; sauté 7 minutes or until the chicken is done. Remove chicken from pan. Add sliced onion and sliced bell pepper to pan; sauté 5 minutes or until onion starts to brown. Add olive oil, salt, black pepper, and presliced exotic mushrooms to pan; sauté 3 minutes or until mushrooms are tender and onion starts to caramelize. Add Marsala wine and chicken to pan, and cook for 1 minute or until thoroughly heated. Serve immediately.