Preheat the oven to 200°C (180°C Fan, Gas Mark 6). Grease and line 2 large baking sheets and unroll the pastry on its packing paper. 

Mix the butter and sugar with a few drops of Natural Vanilla Extract to make a paste and spread over the pastry. Sprinkle with Chocolate Chips. 

Carefully roll up from the longest side, tightly, like a Swiss roll, and press gently to seal the edge. 

Slice into 16 equal pieces and arrange with ample space between each piece on the baking sheets. Press each spiral to flatten slightly. 

Bake in the oven for about 15 minutes until lightly golden. Cool for 10 minutes then transfer to a wire rack.

Serve still warm.