I vote, do it!

Better to substitute melted butter if you have that. The brownies will be OK with the olive oil just a little off tasting

They weren't bad, they just were not as good as usual.

I've never tasted it but I'll bet many people have.

thanks guys.

... your brownies will taste way better than they would have with oil. If you use oil next time, you will notice that they are just not as good as the last batch.

Maybe in bread but not brownies

It has a really strong flavor. Canola (rapeseed) and corn oils work better. Vegetable oil is basically soy. Sesame and olive oil are not good substitutes in most baking scenarios. They're more frying oils.

Got any applesauce? You can use that, strangely enough.

healthier, lower fat content.

I think it tastes better. But when it comes down to it, it is all about your taste.

Virgin or extra virgin olive oil will make for olive flavored brownies which just seems wrong somehow.

I keep two types of cooking oil on hand at all times which are extra virgin olive oil and light olive oil. I use EVOO for salads and dishes where I want to taste the flavor oil. As such I buy a good grade of EVOO that's more expensive. I use light olive oil for sauteing and frying and pretty much anything else that would normally call for vegetable oil.