How ripe should the bananas be?
Riper than you think. Look for bananas that are heavily speckled or mostly brown. That is where the sweetness and the banana aroma really show up.
Can I use frozen bananas?
Yes. Thaw completely, then drain off excess liquid before mashing. Frozen bananas can be a bit wetter, and draining helps keep the loaf from baking up heavy.
Why did my loaf sink in the middle?
Usually it is one of three things: underbaking, too much banana or liquid, or overmixing. Bake until a toothpick comes out clean or with a few moist crumbs (not wet batter), and mix just until the flour disappears.
How do I keep the chocolate chips from sinking?
A thicker batter and smaller chips help the most. Tossing the chips with 1 teaspoon of flour can help a bit too, especially if your batter is on the looser side. Also, fold gently and avoid turning the bananas into a watery puree.
Can I make this into muffins?
Yes. Divide into a lined muffin tin and bake at 350°F for about 18 to 24 minutes. Same toothpick rule.
What if I only have whole wheat flour?
You can swap in up to 50% whole wheat flour. The loaf will be a bit heartier and slightly less tender, but still very good.
Does the pan type matter?
Yes, a little. A light metal loaf pan bakes the most evenly. Dark metal pans brown faster, so start checking a few minutes early and tent with foil if needed. If you are using glass, the loaf may take a bit longer, so rely on the toothpick test.