Instant Pot Confetti Birthday Cake

Ingredients

• Nonstick cooking spray
• 1 1/2 cups 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
• 1 1/2 cups confectioners' sugar
• 1 teaspoon vanilla extract
• 1 large egg, at room temperature
• 1/2 cup sour cream
• 4 1/2 cups confectioners' sugar
• 24 tablespoons (3 sticks) unsalted butter, at room temperature
• 1 vanilla bean, split
• 2 to 3 tablespoons heavy cream

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