well it depends what it says in the ingredients. If it does say to use it, I recommend Hellman's but if it says not to use it, don't use it. but it is really your choice! Have fun making your chocolate brownies!
It really depends on the recipe, but in most cases, yes, salad dressing can be used as a substitute for mayonnaise.
Greek yogurt or sour cream can be used as a substitute for mayonnaise in baking.
Yes, in some recipes. Remember that mayonnaise contains quite a bit of oil as well as eggs, so adjust your recipe accordingly.
Pickles or gherkins can be used as a substitute for cornichons in a recipe.
Green tomatoes can be used as a substitute for tomatillos in a recipe.
Gelatin can be used as a substitute for agar powder in a recipe.
Butter or margarine can be used as a substitute for shortening in a recipe.
Artichoke hearts can be used as a substitute for hearts of palm in a recipe.
Basil leaves can be used as a substitute for shiso leaves in a recipe.
Cremini or button mushrooms can be used as a substitute for chestnut mushrooms in a recipe.
Ground sassafras leaves can be used as a substitute for gumbo file in a recipe.
Lemon juice or vinegar can be used as a substitute for tamarind puree in a recipe.