3/4 cup butter
10 oreo cookies plus more to sprinkle inside
1/4 cup icing sugar
in a food processor add the ground almonds and pulse, then add the icing sugar and pulse again until a fine powder then pour into a bowl for later and add the oreo halves into the food processor
and pulse until fine and stir into the icing sugar/almond mixture.
then whip the egg whites and salt until foamy and add the caster sugar a spoon full at a time.