Combine ingredients for crust, press into 9×13 inch pan. Bake for 10 minutes at 350 degrees Fahrenheit.
Melt chocolate and butter. Blend eggs and sugar, then add in chocolate. Stir in flour and baking powder. Spread onto crust. Bake for 15 minutes at 350 degrees Fahrenheit. Cool.
Blend ingredients for topping, then spread onto cake. Bake for 30 minutes. Cool thoroughly and cut into one-and-a-half-inch squares.
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