Sprinkle the porterhouse with salt and pepper. Heat the oil in a large skillet over medium-high heat. Once the oil is hot, add the steak and sear until golden brown on both sides, 3 to 4 minutes per side. Remove from the skillet from the heat. Transfer the steak to a plate and add the mushrooms and shallot to the skillet. Return the skillet to medium heat, and cook, stirring, until the porcinis are golden brown. Remove skillet from the heat again. Pour in the brandy, slowly put back on heat and allow the alcohol to flame up. Once flame is out, add the heavy cream, butter and porterhouse. Let simmer until sauce thickens. Remove veal porterhouse and place in the oven until desired temperature. Transfer the steak to a serving plate, top with the sauce and sprinkle with parsley. Serve and enjoy.