I don’t know if this applies if you’re making scratch brownies, but the box mixes say if you’re using non-stick pans to shorten the baking time by three minutes. I’m only mentioning this because I haven’t seen too many glass round pans and assume if you’re using cake pans they’re non-stick. Plus, an 8" x 8" glass pan uses a lower temperature and a MUCH longer baking time, so I would figure a non-stick to behave similarly. But I’m not Betty Crocker.