Preheat the oven to 180c/350f.
Mash the bananas in an oven proof dish (we used a 20x20cm dish).
Add the nut butter and oats and stir together. Depending on how soft the bananas are, you may need up to 1/4 cup of extra oats to make it a thick batter (also, for babies under 12 months, add 1/3 cup of plant milk to soften the slice). Reserve ~ 1/4 cup of the mix to use on top (omit the topping for under 18 months). Flatten the base, spread the chia jam over in a thick layer, then add the extra oats to the reserved batter & crumble on top.
Bake for 25-30 minutes until golden.
Remove from the oven and allow to cool fully in the dish. The oats and jam will firm as it cools.
Slice into ~8 pieces, and enjoy!
Store in an airtight container in the fridge for 5 days, at room temp for 2 days, or freeze for 3 months.
