1. Mix cream cheese, sugar, and vanilla until fluffy. Freeze into small balls.
2. Whisk together flour, black cocoa, baking powder, and salt.
3. Cream butter and sugars, then add egg yolks and vanilla.
4. Mix in dry ingredients until combined.
5. Scoop dough, wrap around frozen cheesecake filling, and roll smooth.
6. Coat each ball in cocoa-sugar mix.
7. Bake at 350°F for 10–11 minutes. Cool before serving.