Step 1: Mash Bananas and Mix Wet Ingredients: Place the 3 overripe bananas in a large bowl and mash with a fork — don't puree completely. Leaving some small chunks gives the bread more texture and personality. Add the eggs, melted butter, and sugar, and whisk until well combined.
Step 2: Pour Batter into Bread Machine Pan: Pour the banana mixture into the bread machine pan. Then add the flour, baking soda, and salt directly on top — liquids first, dry ingredients second, so the paddle can mix evenly. If using walnuts, add them now.
Step 3: Insert Pan into Bread Machine: Place the pan into the bread machine and lock it into position. Make sure the kneading paddle is properly installed. Close the lid.
Step 4: Select the Quick Bread Setting: Choose the "Quick Bread" or "Cake" cycle — do NOT select "Basic" or "Whole Wheat," as those cycles include kneading and proofing stages that don't work for baking-soda-leavened breads. Set the weight to 2 pounds and the crust color to "Light" or "Medium." Press start.
Step 5: Remove, Cool, and Slice: When the cycle finishes (usually 1.5–2 hours), use oven mitts to remove the pan. Invert onto a cooling rack — if the loaf sticks, run a silicone spatula around the inside edge. Let cool for at least 15 minutes before slicing — hot banana bread is too soft and will fall apart. Use a serrated knife to reveal the moist crumb and walnut distribution.