Prep batter: In a large mixing bowl, mash bananas until smooth. Stir in pumpkin purée, melted butter, eggs, vanilla, and sugar until well combined.
Mix dry ingredients: In a separate bowl, whisk together flour, baking soda, salt, and cinnamon.
Combine: Gently fold the dry mixture into the wet ingredients until just combined (don’t overmix). Stir in walnuts and chocolate chips.
Bake: Pour batter into a greased loaf pan that fits in your air fryer. Air fry at 375°F for 45–50 minutes, or until a toothpick inserted in the center comes out clean.
Cool & enjoy: Let the bread cool in the pan for 10 minutes before transferring to a wire rack. Slice and enjoy warm or at room temp.