Preheat your oven to 300°F and prepare a water bath setup in a deep baking dish.
In a bowl, whisk together the whole eggs, egg white, and skim milk until smoothly combined.
Scrape the seeds from the vanilla bean and add them to the mixture along with the vanilla bean itself for extra aroma.
Stir in the vanilla whey protein isolate gently to ensure it is fully incorporated without creating lumps.
Pour the custard mixture into ramekins, then place the ramekins in the water bath.
Bake in the preheated oven for 30-35 minutes or until the custard is just set but still has a slight wobble at the center.
Remove the ramekins from the water bath and allow them to cool to room temperature, then refrigerate for at least 2 hours.
Before serving, sprinkle a thin, even layer of granulated sugar over the top of each custard.
Using a kitchen torch, carefully caramelize the sugar until it forms a crisp, golden top. If a torch is not available, place the custards under a broiler for 1-2 minutes, watching closely to avoid burning.
Serve immediately and enjoy the delightful contrast between the creamy custard and the crunchy caramelized top.