Preheat oven to 180°C and grease a 30x45cm (12x18inch) baking pan.
Crush the biscuits. Mix the crushed biscuits with the melted butter/margerine and press the biscuit mix into the bottom of the greased pan.
Mix the condensed milk and yogurt together, pour on top of the biscuit base.
Bake in the middle of the oven for 10-15 minutes. Leave to cool then refrigerate until cold, cut and serve.
Use flavoured yogurt and add small chopped pieces of fruit for a variety of flavours.
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