Preheat oven to 400℉ and line a baking pan. In a small bowl, combine the egg and milk, whisk together well. Set aside.
Sprinkle a little flour over your counter and on your rolling pin. Roll the first sheet of pastry into a 12in x 12in square. (**See notes) With a football cookie cutter, or whatever shape you want, cut as many shapes as you can, hopefully in an even number. You can take the scraps and reroll a couple of times to get a couple more shapes. Just ensure you don't overwork the pastry or it will get tough.
Lay the cut out footballs on the pan and dollop about 1 tbsp of pizza sauce, or sauce you're using, into the middle area. Spread it around leaving a 1 inch or 2cm border to prevent leakage. Do this to each football. Only fill half the footballs.
Then add the rest of your toppings, I added cheese and pepperoni. Whatever toppings you use, make sure they're cut small or they may leak or tear through the pastry.
Once you've filled half the footballs, using a pastry brush or paint brush, paint a little egg wash around the border you've left. Then take another football cutout and lay it on top, ensuring you line them up. Using your fingers, pinch the edges together all around. Make sure they're aren't any gaps or the filling can leak.
Do this to each one and then paint a little more egg wash over the top of each pastry. Bake in the oven for about 18-20 minutes or until golden in colour. Continue this until you've used up all your pastry, including the second sheet of pastry. You may end up with a few scraps leftover at the end. (***See notes)