Brush olive oil into the bottom and up the sides of a large cast iron skillet. I useda 12-inch skillet for 15 rolls.
Place frozen, unbaked dinner rolls into the skillet, 1-2 inches apart. Cover with a tea towel or plastic wrap and set aside to rise for 3-5 hours.
Once the rolls have at least doubled in size, brush with about half of the melted butter, sprinkle with garlic powder and dried rosemary. Brush with butter again, and sprinkle with coarse sea salt.
Preheat oven to 400 degrees and bake about 15-20 minutes, until rolls are a golden brown.
Serve in the skillet and let each guest pull off their own. Or, pull apart and serve in a bread basket.
Notes
Keep in mind the time needed to thaw and proof the rolls. You also want to select a skillet that has enough room for proofing. The rolls will likely double in size. It's ok if they touch once risen (and also ok if they don't!).