Preheat oven to 350 degrees.
Microwave chocolate & butter or margarine in large bowl at high for 2 minutes or until butter or margarine is melted.
Stir until chocolate is melted. Stir in sugar. Mix in eggs and vanilla. Stir in flour and nuts.
Spread in greased 13 x 9 pan. Bake for 35 minutes (do not overbake).
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