Put the 2 Banana (frozen) into a food processor and blend until smooth. You will need to stop it a couple of times and scrape the sides down and start blending again.
Take ⅔ of the mixture out. With the remaining mixture in the food processor, add 4 Frozen strawberries and blend until smooth.
Halve the mixture that you took out and add 1 teaspoon Vanilla extract to one and 1 tablespoon Cocoa powder to another. You should now have 3 flavours of nice cream - vanilla, strawberry and chocolate.
Divide the nice cream between half of the 20 Chocolate chip cookies and then put another cookie on top to make a sandwich.
Notes
Make sure you always keep bananas in the freezer, that way you can make these quickly. We also love adding frozen banana to smoothies, as it makes them nice and cold and thicker too.
Slicing the banana before freezing makes it easier to blend.
Add a little milk if you want a silkier texture. But, only a tiny bit.
You can use different fruit, such as blueberries, raspberries or blackberries.
Add orange or mint extract to change the flavours.
You need to use a high powered food processor to make the banana nice cream. It will look like it isn't doing much to begin with, but keep scrapping down the sides and processing it and it will all come together.
If you want to ensure that there is less mess when eating these, then once you have made them up, wrap them up in plastic wrap and put them back in the freezer for an hour so they can set more.