Can you substitute brown sugar for white sugar whenever you want? Is the amount you use the same? Brown sugar sounds so much better for banana bread, but the recipe calls for 1 cup of white.
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I'm pretty sure you would want to adjust the liquid in the recipe with brown sugar substitution. But, with something as non-techy as banana bread, I'm certain you'd be fine.
Brown sugar will give more flavour than white sugar, which you may or may not want depending on the recipe. I think in banana bread it would be a fine substitution.
It might make the batter/dough a little moister, so maybe add an extra tablespoon or three of flour. But like a PP said, you can play around with quickbread recipes pretty easily.
Re: A baking question
I'm pretty sure you would want to adjust the liquid in the recipe with brown sugar substitution. But, with something as non-techy as banana bread, I'm certain you'd be fine.