Heat the oil in a nonstick pan on medium heat. Add in the sliced chicken and cook until no longer pink on the inside to an internal temperature of 160 degrees. Season with salt and pepper.
Layer the wrap with cheese, spring mix, tomato seasoned with salt and pepper, ranch dressing, and chicken. Fold in the ends and roll up tightly.
Heat a nonstick pan on medium heat. Brown the wrap on both sides starting seam side down until nice and golden brown.