1. Preheat the oven to 180°C and grease a baking pan.

2. In a bowl, mix together the melted chocolate, sugar, apple jelly, and bananas.

3. Add the flour and mix well until everything is evenly combined.

4. Pour the batter into the prepared baking pan and smooth it out.

5. Bake the cake for about 40-45 minutes, or until it is firm and a toothpick comes out clean.

6. Allow the cake to cool completely before removing it from the pan.