Serves: approximately 24 bars
1) Preheat oven to 180C/Gas Mark 4. Butter and flour a baking tray or swiss roll tray. Sift the dry ingredients together and set aside.
2) In an electric mixer, cream the butter, treacle and sugar until light and fluffy. Beat in the egg, add the reserved dry ingredients and mix until just incorporated. Fold in oats, raisins and nuts.
3) Spread dough in an even layer on the prepared trat and bake for 20 to 30 minutes or until lightly browned. Let cool on a rack for 10 minutes then carefully cut into bars approximately 7-cm square. Remove bars from pan and allow to cool completely.