Step 1

Preheat the oven to 450 degrees F (230 degrees C). Line a baking sheet with parchment paper.

Step 2

Combine flour, baking powder, salt, and baking soda in the bowl of a food processor; pulse to mix. Drop cold cubes of butter into the dry mix and pulse just until mix comes together and forms a ball, about 4 to 5 times; do not overmix.

Step 3

Use a butter knife or sturdy rubber spatula to pry the dough out of the food processor and turn it onto a well-floured surface; dough will be very sticky. Don't use your fingers! They're too hot and will start melting the butter.

Step 4

Sprinkle a little flour on top of the dough and gently knead until it comes together into a ball, about 4 to 5 times. Be gentle and do not overwork the dough; you are developing flaky layers and not really mixing it at this point. Gently shape dough into a rectangle and pat to a 1 1/2-inch thickness.

Step 5

Use a non-serrated knife to cut dough into 6 square biscuits. Place on the prepared baking sheet so squares are just touching.

Step 6

Bake in the preheated oven until golden brown on top, about 10 minutes. Remove from the oven and cool on a wire rack. Break biscuits apart just before serving.