Red Velvet Cake:
2 1/2 cups (250 grams) sifted cake flour
1/2 teaspoon salt
2 tablespoons (15 grams) regular or Dutch-processed cocoa powder
1/2 cup (113 grams) unsalted butter, at room temperature
1 1/2 cups (300 grams) granulated white sugar
2 large eggs
1 teaspoon pure vanilla extract
1 cup (240 ml) buttermilk
2 tablespoons liquid red food coloring
1 teaspoon white distilled vinegar
1 teaspoon baking soda

Cream Cheese Frosting:
1 - 8 ounce (227 grams) cream cheese, room temperature
1 - 8 ounce (227 grams) tub of Mascarpone cheese, room temperature
1 teaspoon pure vanilla extract
1 cup (115 grams) confectioners' (icing or powdered) sugar, sifted
1 1/2 (360 ml) cups cold heavy whipping cream (double cream) (35-40% butterfat)