Prepare the pizza dough - If using store-bought pizza dough, follow the package instructions for thawing if necessary. If making your own dough, prepare it according to your favorite recipe or use a pre-made dough mix. Allow the dough to rise until it doubles in size, then punch it down and shape it into a round ball.

Preheat the oven - Preheat your oven to the recommended temperature for baking pizza. This is typically around 450°F (230°C). Place a baking sheet or pizza stone in the oven as it preheats to ensure a crisp crust.

Roll out the dough - On a lightly floured surface, roll out the pizza dough to your desired thickness. If you prefer a thin and crispy crust, roll it out more thinly. For a thicker crust, leave it slightly thicker. Transfer the rolled-out dough to a lightly greased or parchment-lined baking sheet.

Add the toppings - Spread a thin layer of cranberry sauce evenly over the pizza dough, leaving a small border around the edges for the crust. Next, sprinkle the shredded leftover turkey over the cranberry sauce. Evenly distribute the red onion slices, mozzarella cheese, and chopped fresh rosemary on top. Season with salt and black pepper to taste.

Bake the pizza - Place the pizza in the preheated oven and bake for about 12-15 minutes, or until the crust is golden and the cheese is bubbly and slightly browned. Keep an eye on it as baking times may vary depending on your oven.

Garnish and serve - Once the pizza is done, remove it from the oven and let it cool for a minute or two. Garnish with fresh chopped parsley for a pop of color. Slice the pizza into wedges using a pizza cutter or sharp knife, and serve warm. Enjoy your unique and delicious Thanksgiving leftover turkey and cranberry pizza!