Mix butter, sugar, salt and egg until frothy. Mix the almonds, oat flakes, flour and baking powder separately and stir into the butter mixture. Place 2 teaspoons of dough in small heaps (10 g) on a baking sheet, leaving enough space. Bake the biscuits in a preheated oven (190 degree electric stove) for about 15 minutes until they are golden yellow.