- Preheat oven to 350 degrees F (180 degrees C).
- Microwave chocolate and 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 inch pan. Bake for 35 minutes (do not overbake).