Mayonnaise would be your best thing to do. But, Even though Mayonnaise does have eggs in it along with oil don't put any less eggs in I'd say to every half cup of oil would be 2 Table spoons of mayonnaise. But you can usually Eye-ball it.
Definitely. Much better for you, too.
Yes. Margarine is basically solidified vegetable oil, so you should be able to substitute it in a cookie recipe without a problem.
Yes, you can substitute olive oil for vegetable oil in this recipe.
Yes, you can substitute vegetable oil for olive oil in the recipe.
Yes, you can substitute coconut oil for vegetable oil in this recipe.
Yes, you can substitute olive oil for vegetable oil in this recipe.
Yes, you can substitute vegetable oil for canola oil in the recipe.
Yes, you can substitute vegetable oil for olive oil in this recipe.
Vegetable Shortening
A good baking substitute for vegetable oil is applesauce.
Yes, you can substitute vegetable oil for butter in this recipe.
Yes, you can substitute butter for vegetable oil in this recipe.