Put flour and sugar in large bowl. Combine water, margarine and chocolate squares in saucepan and bring to boil. Add chocolate mixture to dry ingredients, then add rest of ingredients. Mix well and pour into well greased jelly roll pan (cookie sheet with 1/2-inch lip). Bake in 375 degrees oven for about 20 to 25 minutes.

Frosting: Combine margarine with milk and chocolate. Boil for one minute. Remove from heat and add to one full box of confectioners sugar, beat until smooth and stir in 1 teaspoon of vanilla. Pour over cake while cake is still warm, allow to set in. After cooling, cut into squares like brownies.