In a medium bowl, combine the shredded chicken and buffalo sauce. Mix well until the chicken is evenly coated.
Lay out the flour tortillas on a clean surface.
Spread 2 tablespoons of ranch dressing on each tortilla.
Evenly distribute the buffalo chicken mixture among the tortillas, placing it in the center of each.
Top the chicken with shredded lettuce, diced tomatoes, shredded cheddar cheese, and sliced green onions.
Fold in the sides of each tortilla and then roll it up tightly from the bottom to the top.
If desired, grill the wraps on a skillet over medium heat for 2-3 minutes on each side until golden brown and heated through.
Slice each wrap in half and serve immediately.