You can substitute olive oil for other cooking oils in most baked recipes, such as quick breads or brownies. Olive oil does have a stronger flavor than some other oils, which may affect the flavor of the baked product. You might want to try using half olive oil and half vegetable oil. Or, if it is the health benefits you are after, try using all canola oil. Canola oil has many of the health benefits that olive oil has, plus it is lighter in flavor.