A taste of zesty lemon tempered with a hit of white chocolate mousse topping is going to create a love for cupcakes like you have never experienced before. This topping is actually an amazing mix of instant pudding and whipped cream! Can you imagine? The white chocolate flavor comes from the pudding, so go ahead and indulge. If you want to substitute the white chocolate flavored pudding with a vanilla pudding, no problem, but expect to see a yellow rather than white color to your topping.
Source: Your Cup of Cake