You should use the same amount of butter. It's probably also best to melt the butter so that it combines well.
Melt the butter & measure the amount it needs. If it needs 2/3 cup oil, use that much melted butter.
I doubt that very much.
The same amount as is used to make regular cookies. What matters is how much marijuana the butter has been cooked in. Not how much butter is in the cookies/brownies.
They will be very dry and unpleasant, but, you can substitute unsweetened applesauce for oil or butter in brownies. A tasty, healthier solution to your problem.
Butter burns at high temperatures, oil does not.The best roast potatoes are cooked in Goose fat, or the fat from the roast joint.If you really want to use butter try half butter, half oil.
You might be able to use shortening and melt it down ...you may want to not cook it as long though it hardens faster if you cook it the same time.
Nothing much. It turns a slightly weird colour, but still tastes exactly the same, so don't worry!
The same amount.
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.
Definitely. Much better for you, too.
Pretty much everyone likes brownies.
Use the same amount of butter.