Preheat the grill to medium-high or 375 degrees. Meanwhile, place the wings in a large zip-top bag and add the cornstarch, salt, pepper, onion powder and paprika. Seal and shake to evenly coat. Transfer directly to the grill and cook 35 minutes or to 170 degrees, turning halfway through.
In a small saucepan over medium-low heat, combine the butter, hot sauce and mustard. Cook, stirring occasionally until the butter melts and the sauce is well blended.
Transfer the wings to a large bowl and add the sauce. Toss to evenly coat with tongs and return to the grill. Cook 15 minutes longer or until the sauce sets. Let cool 5 minutes before serving warm with blue cheese dressing.
Recipe by The Tennessee Magazine at https://www.tnmagazine.org/mustard-medley/