Position a rack in the middle of the oven and preheat to 400 degrees. Pat the chicken dry and sprinkle it on both sides with the salt.
Spread 1 teaspoon of the sriracha on the bottom of each breast and place, sauce-side down, in a casserole or gratin dish.
In a small bowl, mix the mayonnaise with the remaining 1 teaspoon of sriracha and generously spread it on top of the chicken. Roast for 25 minutes, or until golden on top and a thermometer inserted in the thickest part of the meat reads 165 degrees.
Transfer to a plate, sprinkle with the chives or scallions, and serve with juices from the pan spooned over.
