Preheat the oven to 350 degrees F. Lightly butter one 9-by-5-inch loaf pan.
Whisk together the flour, pecans, granulated sugar, baking soda, cinnamon, 1/2 teaspoon salt and nutmeg in a large bowl. Whisk together the eggs, melted butter, buttermilk, brown sugar and vanilla in a medium bowl; stir in the mashed bananas. Fold the banana mixture into the flour mixture until just combined (it's OK if there are some lumps).
Pour the batter into the buttered pan and lightly tap the pan on the counter to evenly distribute the batter. Bake until browned and a toothpick inserted into the center comes out completely clean, about 1 hour. Let the bread cool for 10 minutes in the pan, then turn out onto a rack to cool completely.
To make this banana bread nut-free, just leave out the pecans and follow the rest of the recipe as written.
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