Preheat the oven to 350 degrees.

In a standing mixer fitted with a paddle attachment, combine the butter and powdered sugar. Beat on medium speed until pale, light and fluffy. Add the almond extract, salt and egg. Beat again for 1 minute. Add the flour and almond flour and mix on low until just combined. 
 
Scoop 1 tablespoon sized mounds and roll them in your hands. Place onto a rimmed baking sheet, press down slightly and bake for 15 to 20 minutes or until just set but not brown. Cool slightly on the tray, about 10 minutes. Dust with powdered sugar before removing to a rack to cool completely.