Preheat oven to 180 C (355 F) and line a large baking tray with baking paper.
Mash banana, honey and peanut butter together in a large bowl.
Add egg and whisk to combine.
Add self raising flour and mix until smooth.
Add cheerios one cup at a time, mixing until all the cheerios are coated in the cookie mixture.
Drop small spoonfuls of the mixture onto the prepared baking tray, evenly spaced. Gently press down to flatten slightly.
Bake for 8 - 10 minutes, or until the cookies are just starting to turn golden brown.
Let them cool for 5 minutes before removing from tray.
Makes approximately 30.
Store in the fridge for 3 - 4 days in an air tight container, or freeze in a freezer safe container.