Place chicken cutlets on cutting board. Pat cutlets completely dry on all sides with paper towels. Set aside.
Add paprika, chili powder, salt, and black pepper to small mixing bowl. Whisk or stir to blend spices, then sprinkle mixture over tops of chicken cutlets. Flip cutlets over and season other side with remaining spice blend.
Heat large skillet over medium heat. When pan is hot, add oil. Continue warming skillet until oil is hot and shimmering, then add seasoned cutlets.
Cook cutlets 4 minutes, then flip cutlets over and cook 4 minutes more or until cutlets are cooked through. Internal temperature should register at least 160° Fahrenheit, not to exceed 165° Fahrenheit.
Transfer cooked chicken to medium bowl. Add buffalo sauce to bowl and toss or stir until cutlets are fully coated.
When cutlets are coated in buffalo sauce, assemble sandwiches in the following order: bottom bun, ranch dressing, lettuce, chicken, tomato, top bun. Serve immediately.