Don't overmix: I mix this batter by hand rather than using a hand mixer. Once the flour goes in, mix only until you don't see dry streaks.
Use mini chocolate chips: They distribute more evenly through the loaf and are less likely to sink than full-size chips.
Save some for the top: Keep ¼ Cup of the chocolate chips aside and scatter them over the batter just before baking.
Check more than one spot: Melted chocolate on a toothpick can look like uncooked batter. If you're unsure, test another spot near the center of the loaf.
Watch the pan size: Use the 9 x 5-inch loaf pan called for in the recipe. One reader's loaf rose over the pan, so I wouldn't use anything smaller.
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