Brigid's Baking Powder Biscuits (also good for dinner, with a nice bowl of chowder)
2 cups all purpose flour
2 teaspoons baking powder
1/2 tsp. baking soda
1 tsp fine salt
1/2 cup (a full stick) unsalted butter, frozen solid
2/3 cup 2% or whole milk
Sift all dry ingredients together (into a chilled bowl, if possible). Place a cheese grater over the top of the bowl, and grate the butter through the large holes. (if you hold the butter with a paper towel in your hand, your hand won't freeze and you can then use the paper towel to grease the pan). The result will be a pile of dry ingredients covered with tiny little bits of shaved butter.
Gently mix together the butter and dry ingredients with your hands: it should be loose and crumbly. Add the milk, and stir a wooden spoon, just until the mixture comes together into a loose dough. About two stirs before you think it's done, toss in a handful of grated cheese and some diced bacon or ham.and stir once or twice more. You should be able to pack it into a ball that mostly holds together.
Turn it out onto a floured surface and gently pat down to about 1/2 or 3/4 of an inch (one in photo was 3/4 in) Cut with a biscuit cutter (I used the rim of a juice glass that's been dipped in flour to keep the dough from sticking.),
Cook on a cookie sheet. I find putting parchment paper on top of the sheet makes them brown more evenly but it's not required.
Bake 13 minutes at 425 degrees (my oven runs a bit cool , so you may want 415) to golden brown and delicious.