In a small bowl, combine the yeast, sugar, and warm water. Let stand for 5-10 minutes until foamy.
In a medium bowl, whisk together the flour and salt.
Add the foamy yeast mixture, melted butter, and egg to the flour mixture. Stir until a shaggy dough forms.
Turn the dough out onto a lightly floured surface and knead for 5-7 minutes until smooth and elastic.
Lightly grease a small bowl. Place the dough in the bowl, turning to coat. Cover with plastic wrap and let rise in a warm place for 45-60 minutes, or until doubled in size.
Gently punch down the dough. Divide it into 4 to 8 equal pieces.
Shape each piece into a ball. Arrange the balls in a greased 8×8 inch baking pan, leaving a little space between them.
Cover the pan and let the rolls rise for another 30 minutes.
Preheat your oven to 375°F (190°C).
Bake for 15-20 minutes, or until golden brown.
Brush the tops of the warm rolls with the remaining melted butter.
Notes
For pull-apart rolls, shape the dough into logs and arrange them seam-side down in the pan.
If you don’t have a thermometer, the water should feel warm but not hot to the touch.
You can adjust the number of rolls by dividing the dough into more or fewer pieces.