Melt white chocolate and butter together in a bowl over a bain-marie until fully melted
1 cup quality white chocolate, ⅓ cup unsalted French butter
Meanwhile, add egg yolks, vanilla and one tablespoon of your sugar into a small bowl and whisk with an electric mixer for 5 minutes until the mixture has become lighter in color and creamy.
3 eggs, 2 teaspoon vanilla bean paste, ¼ cup granulated sugar (added in two separate stages)
In a separate bowl, add egg whites and remaining sugar, whisking with an electric mixer until you get soft, peaks
3 eggs, ¼ cup granulated sugar (added in two separate stages)
Add the melted chocolate and butter into the egg yolk mixture and mix to combine using a spatula.
1 cup quality white chocolate
Then, add ½ of your egg white mixture into the egg yolks, mixing until well combined. Add the remaining egg whites, this time folding gently to mix until the mixture is smooth.
Add mousse into your serving cups and chill for at least an hour before garnishing.