In a food processor, combine the cold butter and icing sugar. Blend them together for about 10 seconds until they are well combined. Next, add the powdered almonds, rosewater, vanilla extract, and a pinch of salt. Mix this combination for 10-20 seconds until it’s smooth. Finally, add in the baking powder and flour, blending for another 10-15 seconds. Don't stress over the lumps; these cookies are meant to be on the rough and crumbly side.