Substitute for vegetable oil in brownies

Any fat can always replace any other fat, so if you have any of the following around, they can be used as a substitute:

• Butter
• Duck fat
• Olive oil (yes, it's a vegetable oil, which you say you don't have, but you might not have thought of this one)
• ...

Note however, that using different fats will change the texture and taste of the final product. (if you're used to very soft brownies, butter will give you a less soft experience and duck fat will change the taste)

You can use applesause it works better if you ask me I can't have oil so I use applesauce use the same as the recipe calls for

You can use margarine as a substitute for vegetable oil. Melt the margarine, wait for it to cool to room temperature, and replace the melted margarine for vegetable oil using a 1:1 ratio. However, this ratio may vary between recipes, so this isn't ideal unless you're used to using margarine in a particular recipe.