Prepare the Cake:
- Preheat the oven as directed on the cake mix box.
- Make the white cake batter according to package instructions, using only egg whites to keep it white. Stir in ½ cup of white chocolate chips.
- Pour batter into a greased 9×13-inch baking pan and bake as per instructions.
2. Poke and Add Raspberry Syrup:
- Once baked, let the cake cool slightly.
- Use the end of a spoon to poke holes all over the cake.
- Pour raspberry syrup evenly over the cake, making sure it seeps into the holes.
3. White Chocolate Drizzle:
- Melt ⅔ cup of white chocolate chips in the microwave in 30-second intervals, stirring until smooth.
- Mix in sweetened condensed milk and pour over the cake, letting it soak into the holes.
4. Cool and Frost:
- Let the cake cool completely.
- Spread a generous layer of buttercream frosting over the cake.
5. Finishing Touches:
- Sprinkle the remaining white chocolate chips over the frosted cake.
- Slice and serve!