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Heat the oven to 350 degrees.
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Butter the bottom and sides of a 8" springform pan.
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Line the bottom of the pan with parchment and butter the parchment paper.
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Separate the eggs. Beat the egg yolks with the sugar for 5 minutes.
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In a separate bowl beat the egg whites until stiff.
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Add the 1/2 c butter to the sugar mixture. Stir in the chopped chocolate gently.
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Stir in 1/3 of the flour gently.
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Stir in 1/3 of the egg white folding together as lightly as possible.
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Repeat, alternating between the flour and the egg whites.
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Pour cake batter into the prepared pan.
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Bake cake for 50 minutes.
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Cool cake on a wire rack.
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To prepare gananche, heat the cream until hot but not boiling.
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Pour the crean over the chocolate.
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Stir occasionally while mixture is cooling. When completely cooled, beat with electric mixer until fluffy, 5-10 minutes. Do not overbeat or the mixture will be very stiff and hard to spread.
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Place the cake back into the springform pan and top with the ganache. Wrap and chill until firm.
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Remove from pan and serve.