Add frosting to the brownies and bump up the price, add something small to some of them and increase the price by at least $0.25.Like sprinkles to cup cakes or a hershey kiss right in the middle, get creative. and do the math before you start selling.Another you can do if you haven t already incorporated it, is to make something really cheap and easy to make that you will sell for like 2 for a $1. Or 1 for $0.50, that way you will widen your market.
I would go to any of the multiple recipe sites on the internet and try expanding into other baked goods. Try making different types of brownies, and expand to danishes and coffee cakes. Try to keep costs low, just as any other business. But of course, make sure the product is worth the money!
Never sigh to ask people. Its the people who will give you the ideas for your business. The right place will be the school itself. goodluck