Preheat your oven to 350°F (175°C). Grease and line two 8-inch cake pans.
In a bowl, whisk together flour, baking powder, and salt.
In another bowl, beat butter and sugar until light and fluffy.
Add eggs one at a time, mixing well after each addition. Stir in vanilla.
Alternate adding dry ingredients and milk, beginning and ending with dry ingredients.
Divide batter evenly between pans and bake for 25–30 minutes. Let cool completely.
For the cream, whip heavy cream, mascarpone, powdered sugar, and vanilla until soft peaks form.
Place one cake layer on a plate, spread cream, and add a layer of berries.
Add the second cake layer and frost the top and sides.
Decorate with remaining berries in a festive pattern. Chill before serving.