Crack the eggs into a small bowl or directly into the blender. Add the sugar & half and half and press the pulse button for 5 seconds.
Select the cook function and choose the low setting. Every 5 minutes press the pulse button for just 1 second. Allow to heat for 25 minutes and check the temperature. By the 25 minute mark, the temp usually is 150°F/66°F and you want to hold that temperature for 5 minutes.
After the eggnog is cooked and held for 5 minutes at 150°F/66°C, add in the heavy cream, spices, and vanilla extract. Select the smoothie button. Once that program is completed, your eggnog is ready to be chilled.
If your mixture is getting hotter than 150°F/66°C, pulse for a few seconds and remove the center piece on the lid to allow some heat to escape. You can double this recipe, but the time it takes to reach 150°F/66°C may be longer due to the increased volume.