| Preheat the oven to 180c then grease and line a baking tray (9x13 inch/23x33 cm or similar). |
| In a bowl combine the oat ‘flour’ and baking powder. |
| In a small saucepan melt the butter then pour into another bowl and combine with the peanut butter, vanilla extract, mashed banana, sugar (if using) and lastly the eggs. Mix together until combined. |
| Then fold in the flour mixture to the wet mixture until absorbed. |
| Stir in the chunks of chocolate. |
| Then transfer the mixture to the baking tray and press to spread the mixture and flatten out. |
| Bake on the middle shelf of the oven for 20-25 mins or until golden. |
