Preheat the oven to 180ºC. Line the baking tin with baking paper so that the paper covers the base and comes up the sides at least 1cm. 

Layer 1: Place the butter in the 30cm x 20cm slab tin or casserole dish. While the oven is preheating add the baking tray to the oven to allow the butter to melt. As soon as the butter is melted remove the baking tin from the oven. 

Layer 2: Crush the biscuits in a food processor and add the cinnamon and salt. Sprinkle the crushed biscuits over the melted butter. Press into the tin with the back of a metal spoon.

Layers 3 & 4: Sprinkle the dark & milk chocolate chips evenly over the crushed biscuits. Press into the biscuit layer with the back of a metal spoon.

Layer 5: Then sprinkle the pecans over the chocolate chips. Press into the chocolate chips layer with the back of a metal spoon.

Layer 6: Then sprinkle the shredded coconut over the pecans. Press into the pecan layer with the back of a metal spoon.

Layer 7: Then pour the sweetened condensed milk evenly over the coconut. 

Place in the oven and cook for 35 minutes. 

Remove from the oven and allow the slice to completely cool before removing it from the tray and cutting into squares or bars.