1. Preheat oven to 400 degrees F for muffins, mini loaves and mini Bundts or 375 degrees F for a large loaf. Coat pan(s) (see Pan Options) with cooking spray.
2. Prepare Quick-Bread Dry Mix, adding nutmeg to it.
3. Whisk eggs, buttermilk, brown sugar, butter, oil and vanilla in a large bowl until well combined.
4. Make a well in the center of the dry ingredients, pour in the wet ingredients and stir until just combined. Add banana, walnuts and chocolate chips. Stir just to combine; do not overmix. Transfer batter to the prepared pan(s). Top with additional walnuts, if desired.
5. Bake until golden brown and a wooden skewer inserted into the center comes out clean, 22 to 25 minutes for muffins or mini Bundts, 35 minutes for mini loaves, 1 hour 10 minutes for a large loaf. Let cool in the pan(s) for 10 minutes, then turn out onto a wire rack. Let muffins and mini Bundts cool for 5 minutes more, mini loaves for 30 minutes, large loaves for 40 minutes.

Yield: 12 servings