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Preheat oven to 350F. Spray a standard loaf pan (8 1/2 x 4 1/2 inches) with cooking spray and set aside.
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In a large bowl, beat butter, apple sauce and sugar until combined. Add mashed banana and beat in. Repeat with eggs and vanilla extract. Finally, add flour, baking soda, and salt. Beat to combine, scraping down sides of the bowl as necessary. With a rubber spatula, fold in chocolate chips or nuts, if using.
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Pour into prepared loaf pan and bake for 55-60 minutes, until a toothpick inserted into the center comes out clean.
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Allow to cool for 15 minutes in plan before removing and transferring to a wire rack to cool complete.
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Store, covered in plastic wrap, at room temperature.