Step 6: Add flour
The next step is an important one in quick bread baking – combining the wet and dry ingredients. Just like muffins, quick bread batter does not like to be overmixed. If you overmix the wet ingredients and the dry ingredients, the gluten in the flour will begin to over-develop. Over-developed gluten will produce a tough, dry, and rubbery banana bread.

For that perfectly moist and tender crumb, add the flour mixture to the butter mixture and mix just until incorporated. Your batter won’t be perfectly smooth, but that’s okay. You just want to mix until you no longer see big pockets of flour. You can also do this part by hand – it gives you better control and prevents overmixing.