Combine the melted butter, brown sugar, beaten egg and vanilla essence in a large bowl. Sift together the flour and baking powder and add to the mixture along with the rolled oats. Press 2/3rds of the mixture onto the base of a greased, lined 25 × 30 cm baking dish and place in the fridge to chill while preparing the filling.
Place the chocolate, NESTLÉ Sweetened Condensed Milk and butter in a small saucepan. Stir over low heat until the chocolate is melted and the mixture is well combined. Mix in nuts and essence.
Spread filling over the base and then crumble over the remaining base mixture. Bake in a 180 °C preheated oven for 30 minutes, or until golden brown.
Cool to room temperature, then refrigerate until firm before cutting into bars.
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