Minnie, The Ultimate Brownie Guide will help you adjust for flaky, chewy, fudgy, cakey, whatever you're looking for:
Her Peanut Butter Slutty Brownies are my favorite ever:
But if I want a classic brownie, her Ultimate Brownies:
I also find that to get a perfect brownie, you have to really watch your oven temperature and almost undercook them. It's better to pull them a little soon than a little late. If a toothpick is coming out clean, they're already overcooked.