Preheat oven to 160°C (fan-forced 140°C). Line a slice tin (approx. 20cm square) with baking paper, leaving overhang.
In a saucepan over low heat, melt butter, brown sugar and honey, stirring until smooth and combined. Do not boil.
Combine dry ingredients: In a large bowl, add rolled oats and the nuts/dried fruit mix. Stir to combine.
Mix together: Pour the warm butter mixture over the dry ingredients. Stir thoroughly until everything is evenly coated.
Press firmly into tin: Transfer mixture to the lined tin. Use the back of a spoon or a flat-bottomed glass to press down very firmly and evenly. (This step is key to stopping the bars from crumbling.)
Bake for 20–25 minutes, or until lightly golden around the edges.