Preheat oven to 450 degrees

Slice chilled butter into ½" slices and place in blender or food processor.

Add flour, salt, and baking powder to the blender and pulse about 10 times until butter is incorporated.

Place flour mixture into a medium bowl and set aside.

In a separate small bowl whisk together egg and water.

Add liquid mixture to solid and stir until just combined (don't overhandle the dough or your biscuits will be tough.)

Using a spoon and your hands, form six biscuits onto a Silpat or parchment-lined baking sheet.

Bake in preheated oven for 10-14 minutes (check them at 10 and slice one open. If it's still a little wet inside bake for another 2-3 minutes. Don't overcook!)