Heat the oven to 450 degrees F. Coat a 13×9 baking pan with non-stick spray.

In a large bowl, whisk together the flour, baking powder, baking soda, and salt.

Grate the butter on the large holes of a box grater and add it to the flour mixture. Use a wooden spoon to mix in the butter — and don’t be gentle. 

Make a well in the flour-butter mixture and pour in the buttermilk. Mix together with the wooden spoon. Use a 1/3 cup measure (or medium ice cream scoop) to scoop the dough out into the baking pan, the dough rounds will touch and this helps them rise better in the oven.

Bake the biscuits for 12 to 15 minutes or until the biscuits are dark golden brown. Cool for 5 minutes in the pan and then serve with butter or jam.