Make sure butter is VERY cold. Cut butter into small cubes and place it in the freezer
Mix together all dry ingredients in a food processor
Gradually cut the butter into the dry ingredients using the food processor until it appears as a course crumbly mix
Transfer the mix into a large bowl and create a small well in the middle with your fingers
Add the cold buttermilk, mixing until it is all combined. Dough slightly sticky/tacky
Turn dough out onto a floured surface and shape into a rectangle shape, about twice as wide as it is tall
Fold the rectangle in half, so you end up with a thick square. Gently pat back down to a rectangle shape again.
Repeat folding a total of 6 times. Be gentle with the dough, overworking it will make for tough, heavy biscuits. Pat down the last time to a rectangle about 1 inch thick.
Use a 2 ½ inch biscuit cutter to cut out biscuits and place them on a lined cookie sheet, almost touching
You can combine and recut leftover scraps, but not more than once or twice.
Bake at 450 degrees for 12-15 minutes until browned