Name: Instant Pot Confetti Birthday Cake
Prep time: 285 min
Cook time: 55 min
Yield: 8
Ingredients: Cake:; 195g bleached cake flour (see Cook's Note); 3 tablespoons rainbow sprinkles, plus more for decorating; 2 1/2 teaspoons baking powder; 1/4 teaspoon baking soda; 3/4 teaspoon kosher salt; 8 tablespoons (1 stick) unsalted butter, at room temperature; 200g confectioners' sugar; 1 teaspoon vanilla extract; 1 large egg, at room temperature; 125g sour cream; Buttercream:; 585g confectioners' sugar; 24 tablespoons (3 sticks) unsalted butter, at room temperature; 1 vanilla bean, split; 2 to 3 tablespoons heavy cream