Question: how much caffeine in a dark chocolate brownie?
Answer: A one-ounce square of unsweetened baking chocolate contains 23 milligrams of caffeine. If you look at a large, 3.5-ounce bar of very dark chocolate (70-85% cocoa), you'll find around 80 milligrams of caffeine. A similar bar of plain milk chocolate averages 20 milligrams of caffeine.