To make fluffy baking powder biscuits, sift 1 cup flour with 2 teaspoons baking powder and 1/2 teaspoon salt. Cut 2 tablespoons of cold, unsalted butter into the dry ingredients and then stir in 1/4 cup plus 2 tablespoons of milk, stirring until the mixture forms a rough dough.
Flour a flat work surface, and knead the dough until it becomes smooth. Roll the dough out to 1/2-inch thickness. Use a 2-inch biscuit cutter to cut circles out of the dough, and place the rounds on a baking sheet lined with parchment paper. Knead the dough scraps together, re-roll the dough and continue cutting the biscuits. Bake the baking powder biscuits for 14 to 15 minutes at 350 F.
Remove the tray from the oven, and turn the broiler on. Brush the tops of the biscuits with melted butter. Broil the biscuits for one to two minutes.
Alternatively, whisk 2 cups of flour, 4 teaspoons of baking powder, 3 teaspoons of sugar and 1/2 teaspoons of salt together. Cut 1/2 cup of shortening into the dry mixture. Beat 1 egg into 2/3 cup of milk, and stir it into the flour mixture. Knead the dough 20 times, roll it to a thickness of 3/4 inch, and cut it with a 2 1/2-inch biscuit cutter. Bake the biscuits on a greased baking sheet for eight to 10 minutes at 450 F.