Ginger chocolate brownies, anyone? What about spiking the batter with chili powder for some sweet heat? If you think about it, our favorite brownie recipes are really just a base for whatever else we feel like adding in - and once you start experimenting, it's very hard to stop!Make a batch of your favorite brownies (or try our personal favorite recipe!), then play around with mixing in some of these ingredients to the batter. You can add more than one ingredient from each category, but don't go too far over the recommended total amount.