Preheat your oven to 350°F (175°C). Grease and flour the 9x13 inch baking pan.
In a mixing bowl, combine the vanilla cake mix, water, vegetable oil, and eggs. Beat with an electric mixer on medium speed for 2 minutes until well blended.
Pour the batter into the prepared baking pan, spreading it evenly. Bake in the preheated oven for 30 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and allow it to cool in the pan for about 10 minutes. Then, using skewers or toothpicks, poke holes all over the top of the cake.
In a saucepan, gently heat the raspberry preserves until they become pourable. Stir the raspberry preserves over the cake, ensuring it seeps into the holes. Allow the cake to cool completely.
In a separate mixing bowl, beat the softened cream cheese and powdered sugar until smooth.
In another bowl, whisk heavy cream and vanilla extract until soft peaks form.
Fold the whipped cream into the cream cheese mixture until fully combined and smooth. Gently fold in the white chocolate chips.
Spread the white chocolate cream mixture over the cooled cake, covering it evenly.
Chill the cake in the refrigerator for at least 1 hour to set. Before serving, garnish with fresh raspberries if desired.