To prepare the rice stuffed artichokes, you'll first need to gather your ingredients. You can find the ingredients at your local grocery store, or you can make them at home. In a large bowl, toss the cooked rice with the parsley, thyme, salt, and pepper. Then, add the shaved Parmesan cheese and mix until the cheese is melted. Spread the mixture evenly on the inside of the shells of four medium-sized, unpeeled, hard-shelled Artichoke hearts. Cover the hearts with plastic wrap and refrigerate until firm, about 30 minutes. To eat, cut each heart in half and scoop out the center of each half. Spoon the filling into each cavity, then top each one with shredded mozzarella cheese. Bake in the oven at 375?F (190?C) for 20 to 25 minutes or until heated through. Serve warm or at room temperature.