Cake
2 sticks (1 cup, 1/2 pound or 225 grams) unsalted butter, softened
2 cups (400 grams) sugar
4 large eggs, at room temperature
2 teaspoons (10 ml) pure vanilla extract
4 cups (465 grams) cake flour or 3 2/3 cups (460 grams) all-purpose flour plus 1/3 cup (45 grams) cornstarch
2 teaspoons (10 grams) baking powder
1 teaspoon (5 grams) baking soda
1 teaspoon (6 grams) table salt
2 cups buttermilk (475 ml), well-shaken

Frosting
8-ounce (225 gram) block cream cheese, at room temperature
1/2 cup (1 stick or 1/4 pound) butter, at room temperature
1 teaspoon (5 ml) vanilla extract
2 to 3 cups (240 to 360 grams) powdered sugar

Decoration
Powdered sugar
1 cup blueberries (1/2 pint, about 170 grams), very dry
3 cups raspberries (1 1/2 pints, about 360 grams), very dry