Place half of the mixture down, place the solid piece of provolone in the middle, top with the remaining mixture, seal the edges well, shape the loaf as desired and place on a baking sheet.
Bake in a preheated 350F/180C oven until cooked through, about 50-60 minutes.
Spread the sliced provolone over the top of the loaf, return to the oven and broil until the cheese has melted, about 2-4 minutes.
