Spread the thick gravy across the base, like you would with traditional tomato sauce! Scatter the sliced turkey base evenly then follow with the sausage pieces if you like, remove the skins, but its not essential and evenly place the roast potato cubes. Drape the slices of brie on top (these will melt over the rest and taste delicious) then scatter the stuffing by either breaking it up with your fingers and letting it fall or placing the small balls on.
Cook the pizza in a preheated oven for 10 minutes (or according to instructions on pizza base packaging) at 200 degrees Celsius, 390 degrees Fahrenheit, gas mark 5 until the brie is bubbling. When you take it out of the oven put a dollop of cranberry jelly in the middle, finished with some chopped parsley. Christmas roast turkey on a pizza!