Preheat oven to 200c/180c/gas 6. Grease two baking trays. Put the flour and canye pepper into a large bowl then add the butter. Rub in the butter with your hands, gently pressing with your fingertips.
Add the 12g of cheese, the Parmesan and poppy seeds. Mix until dough starts to form. Knead on the surface to combine. Flatten into the pans and cover with cling film for 30 minuets.
Take out of the pans and roll into a rectangle. Then cut into thin slices and rearrange onto a pan. Leaving a small space between each of them. Scatter remaining cheese on and cook for 10-12 mins. cool before serving