The texture and consistency would turn out different.
No, that won't work.
Basically they're cookies made with Spanish butter which is butter made with Spanish olive oil.
You will get a much different finished product. Since oil is a liquid and butter isn't, cut the amount in half and some sort of cookie will result. For something like a sugar cookie, it would not work. For a cake like cookie, it probably will. I use oil instead of shortening in biscuits and that seems to work. You just have to experiment.
no
Meringue cookies are butter and oil free. See link below for recipe.
Yes it will. Olive oil should be used more toward savory foods such as meat and vegetables. Olive oil has a unique taste and will effect the taste of your cookies. Instead use a mild no flavour oil such as vegetable oil or corn oil.
You should try to use baking powder instead of baking soda, if that's not the problem try using about 2/3 cup of oil instead of 1 stick of margerine or butter or chill your dough for about 2 hours before you bake the cookies. you could also use more butter.
no it cannot. it can actually burn your cookies. you can use margerine though.
For most cookies you can't use oil in place of shortening.
If a frosting recipe has butter in it, use the butter. Oil will change the consistency and not taste good.
Definitely. Much better for you, too.
You will usually end-up with oily cookies because the oil does not get absorbed and incorporated in the same way during cooking as do solid fats. Try the substitution and see what the cookies look and taste like, experiment a little.