instant vanilla pudding mix
A powdered mix of modified starch, sugar, and vanilla flavoring that thickens on contact with cold milk, with no cooking needed, to set into pudding within minutes. In baking, a small box stirred into cake batter (without making the pudding itself) adds extra moisture and a denser, more tender crumb than the cake mix alone produces.
Buying guidance
The "instant" version is the one that matters for baking with it dry -- it sets up with cold milk, unlike "cook and serve" pudding mix, which needs to be heated and won't work the same way stirred dry into batter. "Small box" (about 3.4 oz) is the standard size; a "large" or "family size" box is roughly 5.1 oz and isn't a 1:1 swap without adjusting other liquid amounts accordingly.
Substitutions
- A different brand's instant vanilla pudding mix -- freely interchangeable 1:1.
- Instant French vanilla pudding mix -- slightly richer, custard-like flavor; works the same way structurally.
- Omit entirely -- the cake will be slightly less moist and dense, closer to a plain box-mix cake.
Tips & common mistakes
Used dry, straight into batter, rather than prepared as pudding first -- adding it as if it were the finished pudding (with milk already mixed in) throws off a batter's liquid balance.
Storage
An unopened box keeps for many months at room temperature past its printed date. Once opened, keep the dry mix sealed and dry -- moisture will start the thickening reaction early and clump the powder.