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Put chocolate, heavy cream and butter in a heatproof bowl.
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Place the bowl over a pan of barely simmering water(bain marie) and allow the chocolate to melt, stirring occasionally. Once the chocolate is melted, set it aside.
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Separate the egg whites from the yolks
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Add 1 egg yolk at the time to the chocolate mixture and whisk fast to avoid scrambling the eggs. Once the egg yolks are well incorporated to the chocolate mixture, set aside.
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Beat the egg whites with a pinch of salt for a minute or two then add in gradually the sugar. Keep whisking until stiff peaks form.
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Take about 2 tablespoons of the egg whites and mix well with the chocolate egg yolks mixture, to loosen it a little bit.
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Gently fold in the remaining egg whites to the chocolate egg yolk mixture.
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Pour in serving cups then cover the cups with plastic wrap and refrigerate overnight.
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Decorate the chocolate mousse with your desired decoration(optional).
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Serve.