Step 1 Preheat oven to 425 degrees F (220 degrees C).

Step 2 Line a baking sheet with a silicone baking mat or parchment paper.

Step 3 Whisk flour, baking powder, salt, and baking soda together in a large bowl.

Step 4 Cut butter into flour mixture with a pastry blender until the mixture resembles coarse crumbs, about 5 minutes.

Step 5 Make a well in the center of butter and flour mixture. Pour in 3/4 cup buttermilk; stir until just combined.

Step 6 Turn dough onto a floured work surface, pat together into a rectangle.

Step 7 Fold the rectangle in thirds. Turn dough a half turn, gather any crumbs, and flatten back into a rectangle. Repeat twice more, folding and pressing dough a total of three times.