Not weighing ingredients
If your loaves are yielding inconsistent results, you may be measuring your ingredients incorrectly. Weighing the ingredients will help you make better banana bread. Because it is more accurate, a digital scale is ideal for baking. If you want to buy one, you should get one that weighs both ounces and grams.
Depending on how you scoop, measuring by hand will yield different amounts of the same ingredient. If you use too much flour, your banana bread will be dry. If you use too little, your loaf will be too wet. That is why it is time to retire the measuring cups. Using a scale ensures that you have the correct amount of flour every time. If you don't have one, the best way to measure ingredients is to spoon them into the measuring cup and then level off the top with a straight surface.