Step 1

Preheat the oven to 350 degrees F. Spray an 8 x 8-inch baking pan with cooking spray.

Step 2

In a food processor, pulse 2 1/4 cups of the flour with the baking powder, sugar, baking soda, and salt. Add the cubes of butter and pulse just until the butter is in pieces the size of small peas. Remove the mixture to a large bowl and fold in the buttermilk with a rubber spatula just until the dry mixture has absorbed the liquid. Do not overmix.

Step 3

Place the remaining 2 tablespoons of flour on a work surface and knead the dough for 2 or 3 turns just until it holds together and smooths out. Press into a 6 x 6-inch square. Cut into nine 2-inch squares.

Step 4

Gently place the squares into the baking pan, not quite touching each other. Bake for 15 minutes or until a light golden brown on top. Serve while warm.