Place your Rolos in the freezer. They will need to freeze for a couple of hours at least.
Melt the dark chocolate & butter in a bowl over simmering hot water. Or if you only have 1 bowl like us then melt it in a saucepan ensuring it doesn't burn. You may need to keep taking it off the heat
In your bowl mix together the eggs and brown sugar and whisk, whisk, whisk. You will see the mixture become paler and it should increase in volume.
Once the melted chocolate mixture has cooled, fold this into your egg mixture.
Next fold in the flour & cocoa powder.
Finally get those frozen rolos out and get them in your mixture.
You can add the chocolate chunks into the mixture if you would like or sprinkle on the top before baking as we did.
Place the mixture into the Omnia Oven, we used the silicon insert to make sure it didn't stick.
Smooth the mixture out and add chocolate chunks over the top.
Place the lid on the Omnia and cook over a low flame for 40 minutes. The centre will not look cooked but it will firm up when cooling. This can also be cooked in a conventional oven at 180c for 25-30 minutes.
Leave to cool in the mould for a couple of hours. Turn onto a plate and then load up with the toffee sauce.
Enjoy with a cup of tea!