Add the oats, flour, coconut, brown sugar and cocoa to a mixing bowl and stir to combine
Melt the butter in a saucepan over a low heat or in the microwave. Combine the baking soda with 2 tbsp of boiling water. Add to the melted butter and stir to combine. Add the butter mixture to dry ingredients and stir well to combine. Add to the slice tin and press down firmly with the back of a spoon. Bake in the oven for 15 minutes
Caramel
While the base is cooking in the oven, add then ingredients for the caramel to a saucepan and stir over low heat until the butter melts. Continue stirring while the mixture cooks gently for a further 5 minutes. Pour the caramel onto the hot base layer, spread out evenly and return to the oven for a further 10 minutes; the edges of the caramel with be golden brown
Remove the slice tin from the oven and allow to cool, then place into the fridge to set. Slice and store in an air tight container in the fridge