1. Add more eggs. This is the most obvious solution, as eggs are the main thickening agent in eggnog. Simply add one or two more eggs to your recipe and whisk until well combined.
2. Add heavy cream or half and half. This will also help to thicken eggnog and make it richer and creamier. Add 1/2 to 1 cup of heavy cream or half and half to your recipe and whisk until well combined.
3. Use cornstarch or arrowroot. These are two common thickening agents that can be used in small amounts to thicken eggnog. Add 1 tablespoon of cornstarch or arrowroot to your recipe and whisk until well combined. Cook over medium heat until the eggnog has thickened to your desired consistency.
4. Chill the eggnog. Cold eggnog is thicker than warm eggnog, so if you're looking for a thicker eggnog, simply chill it for a few hours before serving.
5. Add crushed ice. This is a great way to thicken eggnog if you're serving it as a cold beverage. Simply add a few cups of crushed ice to your eggnog and stir until well combined.
With these tips, you can easily make eggnog that's as thick as you like. So go ahead and enjoy a delicious, creamy cup of eggnog this holiday season!