What lets a pale bar legally be white chocolate even though it has none of the brown cocoa solids that make dark chocolate taste bitter?

Answer: Cocoa butter from beans

Cocoa butter from beans ✓ — Right. The surprising legal anchor is the fat from cacao, not the brown powdery part. In the U.S., white chocolate needs at least 20% cocoa butter, plus milk solids and a sweetener cap; the EU uses the same 20% cocoa-butter floor. That means white chocolate is closer to a separated half of the cacao bean than to a random vanilla candy. The argument over whether it is "real" chocolate is really an argument over which half of cacao should count.

Extra vanilla flavor — Vanilla is common, but it is not what gives white chocolate its legal identity. FDA guidance allows flavorings, yet the required ingredient is cocoa butter, with minimum dairy solids and limits on sweetener. A vanilla-flavored candy with no cocoa butter can taste familiar but cannot meet the white-chocolate standard. The hidden twist is that the least chocolate-looking ingredient, pale cocoa fat, is the one doing the legal work.

More roasted milk powder — Milk powder helps create white chocolate's creamy body, but milk alone does not make it chocolate. Both U.S. and EU rules require milk solids, yet they also require at least 20% cocoa butter. A milk-sugar candy can be white and creamy while still missing the cacao-derived fat that makes it white chocolate. The label turns on origin and fat chemistry, not just dairy flavor.