Uses for leftover eggnog?

My bad -- yes, all the eggnog flavors are there, minus the eggnog.

where is the eggnog?

Whoops! I got so distracted remembering how good this cake is, I forgot the link!
https://kathleeniscookinginmexico.wordpress.com/?s=egg+nog+cake

Here is a recipe for the most tender eggnog cake ever. It's too bad I only make it once a year. :)

Turn it into a glaze for muffins or a quick bread

In sum, it works well as a substitute for whole milk or cream in baking. Also consider muffin pans as a destination for your leftover eggnog. Gingerbread or a citrus-flavored quick bread. A custardy-pie filling or flan. British-style rice pudding which requires 2 cups of milk to 1/3 cup short-grain white rice [Epicurious recipe from GOURMET, Dec. 2007; cf. comments dated 3/01/08 ;) for further recommendations]. When the eggnog is still very fresh, you might add frozen fruit to make a smoothie or lasso provided that the spices complement your additions.

It's great for French Toast. Or, if you have an ice cream freezer, you can freeze it as is as ice cream.

Mix with some cubed croissants, dried cranberries/raisins, nutmeg and orange zest and make bread-pudding! :)

Use it to replace some or all of the milk in your favorite overnight French toast recipe.

Add some gelatin and make panna cotta-esque pudding or eggnog shots ;)

Pour into popsicle molds and freeze for frozen treat, unless there's a lot of alcohol. I'd make a milkshake or maybe some sort of semi-freddo.

This eggnog bundt cake is so good: http://leitesculinaria.com/2960/recipes-eggnog-pound-cake-rum-glaze.html