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