Preheat your oven to 450°F.
This temperature will help the biscuits rise quickly and evenly.
In a mixing bowl, combine Bisquick mix, buttermilk, sugar, and salt.
Gently stir the ingredients until a soft dough forms.
Place the dough on a floured surface.
Knead the dough for about 30 seconds to a minute and then roll it out to approximately 1/2 inch thick.
Use a biscuit cutter to cut out biscuits from the dough.
Transfer these to an ungreased baking sheet.
Re-roll the scraps and repeat until all dough is used.
Brush the tops of the biscuits with melted butter.
Place them in the oven for about 8-10 minutes until golden brown.