Preheat your oven to 350°F (175°C). Grease that doughnut pan like it owes you money.
In a bowl, whisk together flour, sugar, soda, powder, cinnamon, and salt.
In another bowl, stir coffee, plant milk, oil, vanilla, and vinegar.
Combine both bowls and mix until just smooth—don’t overthink it like your last text.
Spoon the batter into the doughnut pan, filling each about ¾ full.
Bake for 15 minutes, or until they bounce back like your bestie after a breakup.
Cool in pan for 5 minutes, then transfer to a rack.
For buttercream, beat vegan butter until fluffy. Add powdered sugar in batches, then coffee, vanilla, and salt. Whip until smooth.
Frost cooled doughnuts generously. Use a piping bag, spoon, or your finger (we won't call the etiquette police).
Optional: top with espresso dust or chocolate curls because extra is a lifestyle.