Preheat your oven to 350°F (175°C). Grease a loaf pan or line it with parchment paper.
In a large mixing bowl, beat the butter and sugar until the mixture becomes light and fluffy.
Add the eggs, one at a time, beating well after each addition.
Stir in the mashed bananas and chopped apple until well combined.
In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet mixture, stirring just until combined.
Pour the batter into the prepared pan and smooth the top.
Bake for 60-70 minutes or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.