Set your oven's rack to the center position and preheat it to 400°F. Get two baking pans ready by lining them with parchment paper.
Step 1
In a big bowl, whisk together the flour, sugar, salt, baking powder, and baking soda.
Step 2
Drop in the cold, cubed butter and use a pastry cutter or fork to work it in until it looks like large peas.
STEP 3
In a different bowl, beat together the buttermilk, 1 egg, and vanilla extract.
STEP 4