Preheat the oven to 425F and prepare a baking sheet with a non-stick mat or parchment paper.
Whisk together the flour, sugar, baking powder, baking soda, and salt.
Add the cold, cubed butter and cut the butter into the dry ingredients using a pastry knife or a butter knife until the butter resembles small peas.
Add in the 3/4 cup buttermilk and bring the dough together with your hand. If the dough won’t come together add 1 teaspoon of buttermilk and bring it together again. Continue until the dough comes together—it will still be a bit shaggy but it is mainly together.
Roll or pat the dough into a rectangle on a lightly floured surface. Fold it over itself like you are folding a letter to put into an envelope. Then roll or pat out into a rectangle again. Cut out 10-12 pastries.
Bake for 10-13 minutes or until the tops are golden brown.