Prepare the batter:
- Tear the bread into small pieces, then add melted butter (melt using a double boiler or microwave) and milk.
- Use a fork to mash the bread until it softens and blends with the butter and milk. (You can use slightly stale or frozen bread as long as it's soft, not hard.)

Add the sugar and eggs to a bowl and whisk until the sugar dissolves and the eggs are well mixed. Pour this egg-sugar mixture into the bread mixture from step 1 and stir until combined.

Mash the ripe bananas with a fork until smooth, then add them to the mixture from step 2. Stir until everything is well blended.

Pour the batter into any baking pan you like—round or square. Grease the pan with butter or oil to prevent sticking.

Bake the cake:
- Bake at 350°F (180°C) for 30 minutes (preheat the oven for 15 minutes).
- The cake is done when it's golden and no longer wet in the center. (Baking time may vary depending on your oven.)

Result:
- The cake is dense yet moist, fragrant, and mildly sweet.
- It's delicious served cold.

Note:
Next time, you can use an air fryer at 285°F (140°C) for 25 minutes.