Cream the butter and sugar: Use a hand mixer to whip the salted vegan butter and cane sugar until pale, fluffy, and well-combined.
Add the wet ingredients: Mix in the vanilla extract, soy vanilla milk, and white vinegar until the mixture is smooth (it may look slightly curdled — that’s normal).
Incorporate dry ingredients: Add all-purpose flour, baking powder, baking soda, and instant espresso powder, then mix until a soft cookie dough forms.
Bake the cookies: Scoop the dough onto a lined baking sheet and bake at 375°F for about 12 minutes, or until the edges are lightly golden and the centers look set.
Make the frosting: Blend the mascarpone cheese, powdered sugar, vegan butter, and vanilla extract until smooth, thick, and spreadable.
Frost the cookies: Once fully cooled, spread a thick layer of mascarpone frosting over each cookie and dust generously with sweetened cocoa powder.
Notes
Ingredient substitution - Mascarpone: Mascarpone gives these cookies the most classic tiramisu flavor and a silky, creamy frosting. Cream cheese can work in a pinch, but the topping will taste tangier and thicker.Ingredient substitution - Soy Vanilla Milk + Vinegar: Mixing soy vanilla milk with white vinegar creates a quick dairy-free “buttermilk” effect. This helps keep the cookies soft, tender, and fluffy. Apple cider vinegar also works as a 1:1 swap for white vinegar.Storage: Store frosted cookies in the fridge for 3–4 days. The mascarpone stays freshest when chilled.Freezing: Freeze unfrosted cookies up to 2 months. Frost just before serving.Ingredient Tip: Use instant espresso for the deepest flavor; regular instant coffee won’t be as bold.Substitution: Cream cheese can replace mascarpone, but let it soften fully for smooth blending.Variations: – Add chocolate chips for a mocha tiramisu cookie. – Drizzle with espresso glaze for more intense coffee flavor. – Add a splash of Kahlúa or coffee liqueur to the frosting.