Flour, oats, brown sugar, margarine and baking the base mix and smash until crumbs form. Half was distributed in advance greased and floured pan. Pressed well with a spoon, so as to form a base with a thickness of 1 finger. Margarine, cocoa and sugar are placed in a saucepan. Stir and simmer to melt. The mixture was added to the beaten eggs. Kernels are ground. Flour and baking powder were mixed and poured into the cocoa mixture with ground walnuts. Mix well. The mixture is poured onto the base tray. Dessert sprinkle with remaining dough crumbs. Bake for 30-40 minutes in a preheated 150 C oven. Once removed, allowed to cool. Cut into bars and serve.