Preheat oven to 400°F. Grease a baking sheet.
Sift the flour, baking powder and a good pinch of salt into a bowl,
then stir in the oatmeal, mustard and sugar. Rub in the butter using
your fingertips until it resembles fine breadcrumbs. Stir in the cheese
and apples and bind with just enough buttermilk or sour cream to make a
soft, but not sticky, dough.
Roll out the dough on a floured surface to about ¾-inch thick and
stamp out biscuits usi8ng a 2½-inch pastry cutter. Without
over-handling the dough, press the trimmings together and roll out again
to make more biscuits. Place on the baking sheet, brush the tops with
buttermilk or sour cream and lightly dust with oatmeal.
Bake for 15 minutes, and then cool on a wire rack for a few minutes before serving.
Makes 10 – 12 biscuits.