Heat oven to 375°F. Spray a baking sheet with cooking spray. Set aside.
In the bowl of a food processor, combine the flour and butter. Pulse 5 to 8 times until the butter is broken up into small pieces. Add the milk to the flour mixture and process until the mixture forms a ball.
Turn dough out onto a well-floured surface. Press into an 8 by 4 inch rectangle about ½ inch thick. Fold rectangle in half. Use a 3½ to 4-inch round biscuit cutter to cut five to six biscuits from dough, rolling and re-rolling dough as necessary to use up remaining dough.
If desired, brush biscuits with egg.
Bake 20 to 24 minutes or until biscuits are golden brown. Cool 5 minutes. Serve warm with butter, jam or honey.
Recipe by Espresso and Cream at https://www.espressoandcream.com/2014/07/3-ingredient-flaky-biscuits.html