1. Whip heavy cream, sugar, and vanilla until soft-medium peaks form.
2. Add the mascarpone and gently fold the whipped cream into the mascarpone until smooth and fluffy.
3. Quickly dip each lady finger into cooled coffee (1–2 seconds max).
4. Layer soaked lady fingers into your 4-inch pan.
5. Spread half the mascarpone cream on top. Repeat with another layer of dipped lady fingers and remaining cream.
6. Smooth the top and chill for at least 4 hours (overnight is even better).
7. *Optional: cut out a miffy shape paper.
8. Dust with cocoa powder.
9. Enjoy!