If you have issues with the edges of your banana bread burning, try if using a light-colored metal fixed the problem. Dark metal pans can conduct heat faster, which could lead to burnt edges. A ceramic or glass pan requires a longer baking time, which could also cause burnt edges if your oven needs a little longer to bake the bread. Tent the bread with foil after baking for 45-50 minutes, if it isn't done yet at that point - this can also help reduce or eliminate the burns sides.