Preheat oven to 375°F.
Combine flour, baking powder and salt in a large mixing bowl. Cut in butter using a pastry blender or two knives, until mixture resembles fine crumbs. Add cheese and mix well. Stir in milk, mixing until dry ingredients are moistened.
Pat dough out on a lightly floured surface to a 6-inch square. Cut into 3 x 2-inch recatangular biscuits using a sharp knife, and place on ungreased baking sheet.
Bake in center of oven for 15 to 20 minutes, or until bottoms are lightly browned.