Preheat the oven to 180°C and line a baking tray with parchment paper.
In a bowl, mash the bananas with a fork.
Add the oats, vanilla, mixed seeds and smoothie, then mix well. Add more oats, if the mixture is not malleable.
Let the mixture rest for a few minutes, then add the raspberries and mix again.
Using your hands, make equal sized balls, then press them between your palms. Place these on the prepared baking tray.
Bake in the oven for approx. 15-20 minutes until golden.
Let them cool on a wire-rack then serve.