Preheat oven to 180C/356°F. Line form with parchment paper or grease.
Mash bananas and add applesauce until mostly smooth. Add maple syrup and vanilla extract.
Mix in oat flour, cocoa powder, and espresso powder. Add baking soda, baking powder and salt. Add 2 tbsp of milk at first. Let the batter rest for 5 minutes so the oat flour hydrates. If batter is paste-thick, stir in 1-2 tbsp of extra milk to reach a thick, pourable consistency. Fold in chocolate.
Pour batter into form. Bake for 25-30 minutes or until the top is matte and slightly cracked. A toothpick should come out with moist crumbs.
Cool for a couple of hours (recommended) before serving. Serve with (sugar-free powdered sugar) and enjoy!