Preheat oven to 450 with oven rack in the middle.
Place 1 cup buttermilk in freezer, leave for 10 mins. Melt butter in microwave in 30 sec intervals, set aside.
1 cup buttermilk, 8 tbsp butter
In a large bowl sift 2 cups of flour, 1/2 tsp baking soda and 2 tsp baking powder. Add sugar and salt and whisk together.
2½ cups flour, 1 tbsp sugar, 1/2 tsp baking soda, 2 tsp baking powder, 1 tsp salt
When buttermilk has become very cold but not frozen (about 10 minutes), add to warm butter and stir to incorporate. This will be clumpy. Add to the dry ingredients and mix until it is well combined, and it pulls from sides of bowl.
1 cup buttermilk, 8 tbsp butter
Lightly dust work surface with flour (2 tbsp) and dump dough onto it. Knead dough 10 times and then form into a square. Use a rolling pin covered in flour to roll dough out but leave it about 1 inch thick. Add additional flour to keep dough from sticking to rolling pin or work surface.
Cut into any shape/size biscuit you like and then knead the remaining dough to cut more. Yields 8 biscuits.
Bake in 450 degree oven for 15-20 mins.