"Zuccotto" Cupcakes

INGREDIENTS

• For Cupcakes:
• 1 (18.25 ounce) package white cake mix with pudding
• 1/3 cup vegetable oil
• 3 egg whites
• 1 1/4 cups water
• 6 ounces bittersweet chocolate, chopped fine
•  
• For Filling:
• 1 cup cold heavy whipping cream
• 2 tablespoons confectioners' sugar
• 1/2 cup frozen unsweetened raspberries
• 1/4 cup chocolate-coated toffee bits
• 1/2 cup finely chopped toasted hazelnuts, skins removed
• For Ganache:
• 1/2 cup heavy cream
• 6 ounces semisweet chocolate, chopped
• For Frosting:
• 1 (12 ounce) package white chocolate chips
• 1 cup unsalted butter, at room temperature
• 2 (8 ounce) packages cream cheese, softened
• 2 teaspoons vanilla extract
• food coloring, if desired (optional)