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Adjust oven rack to center position and preheat oven to 425 degrees (400 degrees if using a Pyrex pan). Line a 9-inch square pan with foil, leaving excess foil hanging over, and butter foil well.
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Place chocolate and butter in deep heavy saucepan and melt over low heat. Remove from heat and stir in remaining ingredients in order listed; mixture will be thick.
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Pack firmly into prepared pan. (One way to do this is to cover the mixture with a sheet of wax paper or plastic wrap and press with your fingers or with the bottom of another pan.) Bake 15 minutes.
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Cool in pan on rack for 20 minutes. Cover with one rack and invert onto another rack; remove pan.
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Carefully pull off foil and invert again to cool right side up. Wrap in plastic wrap and refrigerate until completely chilled.
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With long sharp knife, cut brownies in half, then cut each half into thirds.
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Cut each third into 4 strips. Store in airtight container with layers separated by wax paper or parchment paper.