Flapjacks sound quite wholesome, what with the oats-honey-sunshine-and-fields connotations, but these aren't really what I would classify as health food.
200gm porridge oats
25gm dessicated coconut
50gm light muscovado sugar
100gm brazil nuts, chopped
85gm dark chocolate, chopped
5 tbs golden syrup
Gently melt the butter with the sugar and golden syrup. When the sugar has dissolved, mix in the oats and coconut (this stage tastes yummy). Press the mixture into a greased tray. Sprinkle the chopped nuts and chocolate over the top and press into the flapjack mixture. I guess you could adapt this stage to add whatever you like to the top, as long as it is chunky and doesn't burn too easily (maybe dried apricots and almonds? Or dried cherries and white chocolate?).
Chuck into the oven at 180 C for 25 minutes, or until golden.