Preheat your oven to 425º. Cut the butter into cubes and place in the bottom of your 8 inch baking dish. When the oven is almost hot, add the pan to the oven and let it melt the butter and heat up the pan. Be careful not to let the butter burn.
Meanwhile whisk together flour, baking powder, sugar and salt until combined.
Pour in buttermilk, and use a wooden spoon to mix together. Just don't overwork the dough, as soon as it comes together it is good.
Pour into the baking dish with the melted butter.
Use a knife to cut the dough into 9 biscuits. This allows the butter to seep into the cracks and not just stay on the edges.
Bake for 25-28 minutes until golden brown and the biscuits are cooked through.
Remove from the oven and allow them to rest for 5-10 minutes, for the butter to absorb into the biscuits before cutting to serve.
Notes
If you don't have buttermilk mix 2 cups milk with 3 Tablespoons white vinegar and let it stand for 5 minutes before using.