In a small bowl, combine the warm water and 1 tablespoon of sugar. Sprinkle the active dry yeast on top and let it sit for about 5-10 minutes until foamy.
In a saucepan over medium heat, combine the milk and 1/4 cup of unsalted butter. Heat until the butter is melted and the mixture is warm but not boiling. Remove from heat and let it cool slightly.
In a large mixing bowl, combine the activated yeast mixture, the warm milk-butter mixture, 5 tablespoons of sugar, and 3/4 teaspoons of salt. Mix until well combined.
Beat in the large egg, then gradually add the sifted all-purpose flour, one cup at a time, mixing until the dough begins to come together.
Transfer the dough to a lightly floured surface and knead for about 5-7 minutes, or until the dough is smooth and elastic.
Place the kneaded dough in a greased bowl, cover it with a kitchen towel, and let it rise in a warm place for about 1 hour or until it doubles in size.
Once the dough has risen, punch it down to release the air. Divide the dough into 12 equal pieces and shape each piece into a ball.
Spray your skillet with baking spray and arrange the dough balls in the skillet, leaving a little space between each for rising.
Cover the skillet with a towel and let the rolls rise again for about 30 minutes, or until they have puffed up.
Preheat your oven to 350°F (175°C). Bake the rolls for 20-25 minutes, or until they are golden brown on top.
Remove the skillet from the oven and brush the tops of the rolls with the melted butter. Sprinkle with kosher salt for added flavor.
Let the rolls cool slightly before serving. Enjoy them warm on their own or with your favorite spread!