Preheat oven to 350°F (175°C). Line your tray unless you like scrubbing.
Whisk flour, baking soda, and salt in a bowl. Easy.
In another bowl, cream butter and powdered sugar until light and fluffy—like your best hair day.
Add vanilla and plant milk. Mix again like you mean it.
Stir in dry ingredients until a dough forms that doesn’t fight back.
Roll into small balls, flatten gently, place on tray with space for drama.
Bake for 12 minutes, let them cool or suffer the consequences.
For the filling, whip butter, espresso, sugar, and vanilla until smooth and mood-lifting.
Spread or pipe filling on one biscuit, top with another, press gently.
Admire, taste-test, then hide the rest from yourself.