Preheat the oven to 400 degrees Fahrenheit 

Take the calzone out of the fridge and place it on a baking sheet on a tray

Spritz some oil on the calzone and place the calzone in the oven for about 20 minutes. 

Removing the calzone from the oven. Then, cut it through the center to check if the filling has heated through thoroughly.

Place it back in the oven and keep checking after every 5 minutes of the filling doesn't seem to have heated through properly.

Remove the calzone from the baking sheet and allow it to cool slightly before serving it