Place the egg white in a small bowl and use a milk frother to whip it. Note: It will look more foamy/frothed (like milk foam) rather than classic stiff peaks — that’s totally fine and still works for this single serving. Set aside.
In a separate bowl, whisk together: Egg yolk, Greek yogurt, Egg white protein powder, Baking powder, Salt (if using) Mix until smooth.
Gently fold the frothed egg white into the yolk mixture. It won’t fully disappear — that’s normal. Just fold until combined.
Air Fryer Method
Preheat air fryer to 325°FLine a shallow 8 ounce ramekinwith parchment or liner. Lightly grease the parchment. Air fry 8-10 minutes. Check center.Return to air fryer for 1- 2 more minutes if needed.Rest 2 minutes before removing.
Let cool 1–2 minutes. Slice in half. Toast on a regular toaster setting until lightly golden.
Oven Method
Air fryers cook hotter and faster than conventional ovens, so the oven temperature needs to be slightly higher to achieve the same result.Preheat oven to 350°F. Bake for 14–16 minutes.
Store in an airtight container in the fridge for up to 3 days. (Let the roll cool completely before storing to prevent condensation.)