1. Melt the butter and chocolate over a double boiler to 120°F (49°C). Hold the chocolate at this temperature.
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2. While the chocolate is melting, beat the eggs and granulated sugar in the bowl of a mixer fitted with the paddle
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3. Spread the batter evenly onto a paper-lined half-sheet pan. The pan will be very full. Bake at 325°F (160°C) until the center is set, approximately 40 minutes.
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4. Cool completely before cutting. (Refrigerating or freezing brownies before cutting ensures a clean edge.)
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4. Cool completely before cutting. (Refrigerating or freezing brownies before cutting ensures a clean edge.)