Whisk together egg yolks, whiskey and 1/4 cup sugar in a medium bowl. Set aside.
In a large saucepan, whisk together cream, vanilla bean, vanilla seeds and 1/4 cup of sugar. Simmer over low heat until the chocolate is melted. Temper egg yolk mixture by slowly adding hot cream mixture to the egg yolk mixture, with a ladle, a little at a time. Once egg yolk mixture is thoroughly warmed add to the saucepan with the warm cream mixture. Stir until thickened and remove from the heat.
Strain mixture into a bowl over ice.
Place the bowl into the refrigerator for at least 45 minutes. Once cooled, fold in the chocolate chips. Spin in an ice cream maker for 20 minutes until it reaches a soft-serve consistency.
