First Step: Mise en place and candied cranberries (optional)
* Gather all ingredients and let refrigerated items (cream cheese, eggs, cream) sit at room temperature for about 30 minutes. Room temperature ingredients blend smoothly and prevent lumps.
* Make candied cranberries if using them: In a saucepan, heat 1 1/2 cups water and 1 1/2 cups sugar over medium heat until the sugar dissolves. Let the syrup cool slightly, then add 8 oz fresh cranberries, stir, cover, and refrigerate overnight. The next day, drain, coat the cranberries in 1/2 cup fine white sugar and set aside for decoration.

Second Step: Cranberry jam
* Combine 16 oz fresh cranberries, 1 cup white granulated sugar, and 1/2 tablespoon vanilla extract in a saucepan. Cook over medium heat, stirring occasionally until cranberries burst and the mixture thickens, about 12-15 minutes. Remove from heat and cool completely before using.

Third Step: Crust
* Preheat oven to 325 degrees Fahrenheit. Mix 1 1/2 cups graham cracker crumbs with 1/4 cup brown sugar, 5 tablespoons melted butter, and 1 teaspoon vanilla extract until the crumbs are evenly moistened.
* Press the crumb mixture into the bottom and halfway up the sides of a greased 9-inch springform pan. For extra protection during the water bath, wrap the outside of the pan with heavy-duty aluminum foil.
* Spread half of the cooled cranberry jam over the crust evenly.

Fourth Step: Cheesecake filling
* In a large bowl, beat 24 oz softened cream cheese and 1/2 cup white granulated sugar until smooth and lump-free.
* Add 1 teaspoon vanilla extract and 2 tablespoons sour cream; mix until incorporated.
* Add the 2 eggs one at a time, blending after each addition. Mix in 2 tablespoons corn starch.
* Pour in 3/4 cup heavy whipping cream and mix gently until silky. Scrape the seeds from 1 vanilla bean and fold them into the batter.
* Pour the cheesecake batter over the jam and crust, smoothing the top with a spatula.

Fifth Step: Baking in a water bath
* Place the springform pan inside a larger roasting pan. Carefully add hot tap water to the roasting pan until it reaches halfway up the side of the springform pan. This water bath helps prevent cracks and encourages even baking.
* Bake at 325 degrees Fahrenheit for 70-75 minutes. The center should still have a slight 2-3 inch jiggle when done.
* Turn off the oven, open the oven door halfway, and let the cheesecake rest inside for 10 minutes. Remove cheesecake from the oven and roasting pan, then let it rest 20 minutes at room temperature before cooling for an hour on the counter.

Final Step: Top layers, chilling and mousse
* Once the cheesecake has cooled, spread the remaining cranberry jam over the top in an even layer. Refrigerate the cheesecake for at least 4 hours before adding the mousse.
* Prepare the white chocolate mousse: Melt 8 oz white baking chocolate bars (two 4 oz bars) following package instructions. Beat 8 oz cream cheese until smooth and slowly drizzle in the melted white chocolate while beating. Fold in 8 oz whipped topping gently until light and airy.
* Spread the mousse over the chilled cheesecake. Optionally reserve a portion of mousse for piping decorations using a tip size 1M.
* Decorate with candied cranberries if desired. Keep the assembled cheesecake refrigerated until serving. For neat slices, chill at least 4 hours or overnight.