Pre heat the oven to 180c.
To a large mixing bowl, add the porridge oats, mashed banana, milk, melted butter and peanut butter, cinnamon, baking powder and chocolate chips. Mixed until well combined.
Line a baking tray with some baking paper and then split the mixture into either two or four depending on how many cookies you are making. Form into round discs (1cm thick if making two or ½ cm thick if making 4).
Pop in the oven for 14-17 minutes until firm. The cookies will still be a little soft when they come out the oven so leave to cook for 10-15 minutes and they will firm up a little.
Enjoy!