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Preheat the oven to 350 F. Line the bottom of a loaf pan with parchment paper.
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Sift the flour, nutmeg, baking soda, and salt into a medium bowl.
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In the bowl of a stand mixer with the paddle attachment or a hand mixer, beat the sugar, eggs, and butter with a whisk until light and fluffy, about 10 minutes.
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Beat in the mashed banana, sour cream, and vanilla until combined. Fold in the dry ingredients, walnuts, chocolate chips, and any add-ins you like.
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Pour the mixture into the lined loaf pan and bake for 45-60 minutes.