Preheat your oven to 350°F (175°C). Grease and flour a standard loaf pan or line it with parchment paper for easy removal.
In a large mixing bowl, whisk together the all-purpose flour, cornstarch, almond flour, salt, and baking powder until well combined.
In a separate bowl, mash the ripe bananas until smooth. Add the melted coconut oil (or light olive oil) and very strong coffee (or coffee extract). Mix until the wet ingredients are thoroughly combined.
Gradually add the wet ingredients to the dry ingredients, stirring gently until just combined. Be careful not to overmix.
Fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.
Pour the batter into the prepared loaf pan, spreading it evenly.
To make the streusel topping, combine the all-purpose flour, brown sugar, and melted coconut oil in a small bowl. Mix with a fork until crumbly.
Sprinkle the streusel topping over the batter in the loaf pan.
Bake in the preheated oven for about 50-60 minutes or until a toothpick inserted into the center comes out clean.
Once baked, remove the loaf from the oven and allow it to cool in the pan for about 10 minutes. Then, transfer it to a wire rack to cool completely.
Slice and enjoy