Cream butter and sugars. Add egg yolk. Mix baking powder with flour. Add to butter mixture. Spread evenly in 9x13 pan. Bake 160ºC or 25 minutes. Put bars of chocolate on top immediately. Spread when it melts to cover the top. (I put them back in oven for just a minute or two so the chocolate will melt faster). Sprinkle with chopped almonds. Shared by Karen Mintzias