Add chicken ingredients to a zippered gallon bag. Let marinate for at least 4 hours (up to 24hrs).
Preheat oven to 400degF.
In a large saute pan over medium high heat, add chicken with all of the marinating liquid. Pan fry until no longer visibly pink. Add in bell peppers and onions and continue to pan fry until chicken is cooked through.
Lay tortilla flat on a parchment paper covered baking sheets. Sprinkle cheese evenly over each one. Place in oven to bake for 8-10 minutes (until cheese is melted and slightly golden
Put 2-3 chicken pieces and portion of veggies on each tortilla. Finish with a dollop of sour cream.