Melt butter and chocolate together over VERY LOW heat, stirring
constantly. Remove from heat and cool. Beat the eggs until very light
and thickened. Stir in the sugar, then the chocolate mixture, and
vanilla. Sift the dry ingredients together and add, stirring well. I
always mix these by hand, or with my hand mixer.
Bake in a greased and cocoa-powdered 8 x 8 x 2 inch pan at 350
degrees for 30 to 35 minutes. Cool and frost with cocoa frosting or
dust with powdered sugar.