1. Preheat the oven to 190 Degree Celsius.
2. Mix the oats, sugar, raisins and butter in a mixing bowl. Stir well until even.Then scoop the mixture into your baking tin layered with baking paper. Press the mixture down firmly.Then bake in the oven for about 15-20 minutes (until it is golden).
3.Once done. Use a sharp knife to cut out the bars into the size you want and let it cool completely.