Maple syrup – Replace the vanilla with an equal amount of maple syrup. Any changes in flavor will be subtle.
Almond extract – Swap out the vanilla with half as much almond extract.
Vanilla milk – Have vanilla-flavored almond or soy milk in the fridge? Use it to replace the vanilla measure for measure.
Rum or brandy – If you aren’t trying to avoid the alcohol, try an equal amount of rum or brandy.
Vanilla Bean – Scrape out the seeds from half of a vanilla bean, and use them as a stand in for one Tablespoon of vanilla.
Vanilla Paste – Replace the vanilla extract with an equal amount of vanilla paste.