First add a layer of salt to the slow cooker. Then place a stand in it, cover it, and let it heat on medium heat for 15 minutes.
Now take 2 big bananas, peel them and mash them well in a bowl. Add 1/4 cup butter, 1 egg, 1/2 cup jaggery to it. Now mix it well. Then add 1 teaspoon baking powder, 1/2 teaspoon baking soda, ¼ teaspoon salt, 1 teaspoon vanilla extract and mix everything well. Finally add 1 cup maida flour to it.