## Why It Works
Whipping egg whites to stiff peaks creates a foam where air is trapped within an expanded protein network. When that foam bakes at high heat, the proteins set quickly while the air inside expands, producing a light, stable structure. The yolk goes in partway through cooking because it needs less time than the white — you want the yolk still runny while the cloud is fully set. High heat (450°F) is key: it sets the white's surface fast, before the foam collapses.
## How to Do It
1. Preheat oven to 450°F. Line a baking sheet with parchment.
2. Separate eggs carefully. Any yolk in the white will prevent proper whipping — fat kills foam.
3. In a clean, dry bowl, whip whites with a pinch of cream of tartar until stiff peaks form. The whites should hold their shape when you lift the beater.
4. Fold in any additions: grated parmesan, fresh herbs, a pinch of salt.
5. Mound the whites onto the parchment in cloud shapes, using the back of a spoon to make a deep well in the center of each.
6. Bake 3 minutes until the surface is just starting to turn golden.
7. Remove from oven. Working quickly, drop a yolk into each well.
8. Return to oven for 3 more minutes. Yolk should be warm but still runny.
9. Season with salt, pepper, and any garnish. Serve immediately.
## Pro Tips
- Cream of tartar stabilizes the foam and helps the cloud hold its shape longer in the oven. A small pinch makes a real difference.
- Don't skip making the well before the first bake — the white firms up and you won't be able to create a cavity after.
- Additions to consider: parmesan and chives, crumbled bacon, everything-bagel seasoning. Keep add-ins small and dry so they don't weigh down the foam.
## When to Use This
Weekend brunch when you want to make something impressive without much effort. The technique sounds technical but takes under 15 minutes total and produces genuinely striking results.