Ok, so I had one very ripe banana and heaps of frozen berries, but no wholemeal flour, no bi-carb soda and no baking powder.
So, I used one ripe banana, 1 1/2 cups frozen mixed berries, 3/4 cup self raising flour, 1 cup plain flour and 1/2 cup oats.
I also used more water and less oil.
Omg, these muffins are awesome. So easy, so yummy and virtually no mess.