Yellow Cake

Name: Yellow Cake
Prep time: 30 min
Cook time: 28 min
Total time: 58 min
Cuisine: American
Ingredients: 2 and 1/2 cups (285g) cake flour (spooned & leveled)*; 2 and 1/2 teaspoons baking powder; 1/4 teaspoon baking soda; 1/2 teaspoon salt; 1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature*; 1 and 3/4 cups (350g) granulated sugar; 4 large egg yolks, room temperature; 2 teaspoons pure vanilla extract; 1 cup (240ml) buttermilk, at room temperature*; 2 large egg whites, room temperature; 1/8 teaspoon cream of tartar*; 1 and 1/4 cups (282g) unsalted butter, softened to room temperature; 3 and 1/2 cups (420g) confectioners’ sugar; 3/4 cup (65g) unsweetened cocoa powder (natural or dutch process); 3-5 Tablespoons (45-75ml) heavy cream (or half-and-half or milk), at room temperature; 1/4 teaspoon salt; 1 teaspoon pure vanilla extract; optional for decoration: sprinkles