Applesauce can be used as a substitute for vegetable oil in cakes. The conversion ratio is 1:1. Therefore, if the recipe calls for 1 cup of vegetable oil, then 1 cup of applesauce should be used.
All-natural applesauce without added sugar is the best option when picking an applesauce. Many baked goods recipes contain sugar already, and extra sweetener could change the taste of the finished product.
Applesauce also changes the texture and consistency of cake, making it a little chewier than normal. However, unlike oil, applesauce is fat free, so it creates a lower-fat and lower-calorie dessert. One way to enjoy the best of both worlds is to use half applesauce and half oil.