Spray an oven-proof skillet with cooking spray or coat with olive oil.
Place frozen rolls in the skillet, leaving plenty of room for rising. I can get 7 in my skillet. You want a couple of inches between each roll. Cover and allow to rise for about 2-3 hours.
After rising, brush rolls with melted butter. Be gentle with this, you don't want to deflate the rolls.
Sprinkle on chopped rosemary. Sprinkle with the kosher salt.
Bake according to your roll package directions, typically it is about 15 to 20 minutes at 400 degrees, The rolls should be a golden brown and done through.