What happens when you leave out vanilla in a recipe?

Leaving out vanilla in a recipe can result in a less complex flavor profile, as vanilla adds warmth and sweetness that enhances other ingredients. In baked goods, it may make the final product taste flat or less appealing. However, the recipe may still succeed without it, depending on the other flavors involved. You can consider substituting with other flavorings like almond extract or citrus zest for a different but pleasing taste.