Preheat oven to 350° F. Heat butter until it boils; remove from heat and add chocolate; mix until chocolate is melted. Using a mixer with a whip attachment, whip eggs and sugar until stiff, about 5 minutes. Temper the melted chocolate mixture with a little of the whipped egg mixture. Pour tempered mixture into remaining egg mixture; whip until incorporated. Add bourbon and vanilla; mix until incorporated.
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