According to the Hummingbird Bakery, you can use a 9-inch diameter loose-bottomed tart ... this non-stick baking tray boasts ...

Preheat oven to 180°C and line 13 × 9 inch baking tray. Mash the bananas and add the wet ingredients to a large bowl. Mix in raisins and rolled oats. Pour the mix onto your baking tray ...