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1
Pour half-and-half and milk into a large saucepan over medium heat. Cook, stirring intermittently, until heated through, 8 to 10 minutes.
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2
Whisk sugar, stevia, and flour together in a bowl. Add slowly to the hot milk, stirring constantly. Add vanilla beans and continue so stir until mixture comes to a boil. Cook and stir for 2 minutes more. Remove from heat.
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3
Whisk egg yolks in a bowl until smooth. Add about 1 cup of the hot milk mixture to the egg yolks gradually, whisking constantly.
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4
Pour egg-milk mixture back into the main milk mixture in the saucepan. Cook and stir over medium heat until thickened to the consistency of heavy cream, about 4 minutes; do not allow the mixture to boil. An instant-read thermometer inserted into custard should read at least 180 degrees F (82 degrees C). Remove from heat, discard vanilla beans, and let cool completely, at least 30 minutes.
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5
Mix rum, brandy, and bourbon into the custard. Pour into a container and cover with a lid or plastic wrap. Refrigerate custard until well chilled, at least 4 hours.
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6
Pour 2 cups of the chilled custard into a blender; add ice cream and blend until smooth. Pour ice cream mixture back into the chilled custard and mix together thoroughly.
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7
Beat heavy cream in a chilled bowl with an electric mixer just until stiff. Fold whipped cream into the chilled custard mixture, completing the eggnog. Keep refrigerated until ready to serve.
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8
Mix cinnamon, nutmeg, mace, and cloves together and pour into a shaker. Serve individual portions of the eggnog with a dusting of topping.
