Preheat the oven to 200c/390f.
Mash the bananas in an oven proof dish (we used a 12”x10” dish if you want a thicker slice use a smaller dish and bake for longer).
Add the remaining ingredients and stir to combine.
Bake for 25-30 minutes (it will look golden on the sides and will be firm to push) minutes and allow to cool before cutting and serving.
Store in an airtight container in the fridge for 5 days, bench for 2 days, or freeze individual portions for 3 months.