Mash 2 very ripe bananas in a bowl.
Mix in 1 cup of rolled oats, ½ teaspoon of cinnamon, and a ½ cup of raisins.
Scoop the dough onto a lightly greased baking sheet and flatten them slightly with a spoon.
Bake at 350°F (175°C) for 10 to 15 minutes until set.