
Butter and line a 8" / 20cm square dish or pan with baking paper.
Place the Base ingredients in a bowl and mix until combined. Press into the prepared pan.
Melt the Topping ingredients (I do it in the microwave in 2 x 30 second bursts). Pour and spread over the Base - smooth the top or do swirls (see photos for examples of each).
Refrigerate until set - about 1 1/2 hours. Remove from fridge, allow to come to room temp slightly (so top cuts neatly). Cut into 16 squares (or whatever shape you want!). Best served at room temperature.