In a spacious mixing bowl, combine the granulated sugar and the large eggs. Using a whisk, beat them together vigorously until the mixture becomes pale, smooth, and creamy in texture.
Gradually introduce the whole milk and heavy cream into the egg-sugar mixture, whisking continuously to ensure that the two merge seamlessly without any lumps.
Add the vanilla extract, ground nutmeg, and ground cinnamon to the blended mixture. Stir well to evenly distribute the spices throughout, enhancing the flavors of the eggnog.
Carefully pour in the cooled brewed chai tea, mixing gently to incorporate it into the punch. Taste the mixture and adjust the sweetness by adding a little more sugar, if desired.
Transfer the eggnog punch into the refrigerator and chill for a minimum of 2 hours. This resting period allows the flavors to meld beautifully and develop a rich taste.
Once ready to serve, stir the chilled punch thoroughly to recombine any settled ingredients. Pour the eggnog punch into a large, festive punch bowl.
Using a ladle, dispense the eggnog punch into individual glasses. Crown each serving with a generous dollop of whipped cream for a creamy texture.
For an elegant finish, garnish each glass with a cinnamon stick and a delicate sprinkle of freshly grated nutmeg on top.
Notes
Consider serving the punch with festive straws or decorative glasses to add to the celebratory atmosphere.