The pad under the biscuits is also an integral part of the method

Useful to know

King Arthur compares cookies on different baking surfaces, showing that the recipe is not the only factor affecting spread. Contact with the tray influences how the bottoms and edges bake. [1]

Replacing paper with silicone or another lining may change the shape. Keep portion size and temperature consistent when investigating the difference. Do not automatically grease a liner: follow the recipe and the product’s intended use. Comparing baking surfaces is more useful than adding flour without identifying the cause.