in gallon size zip lock plastic bag, combine chicken and salad dressing

seal bag, turning to coat chicken

refrigerate at least 2 hours or overnight, turning bag occasionally

spray large nonstick skillet with cooking spray, heat

add chicken and any remaining marinade, cook turning as needed until chicken is lightly browned 7 to 8 minutes. transfer to plate to keep warm.

spray same skillet with nonstick spray , add onion and peppers, cook until softened about 5 minutes

Top tortillas with chicken , pepper mixture, salsa, and sour cream....roll up nd serve