• 3 cups cake flour
• 2 1/2 cups granulated sugar
• 1 tablespoon baking powder
• 1 teaspoon salt
• 1 1/2 cups (3 sticks) unsalted butter, softened and cut into cubes
• 1 1/4 cup whole buttermilk, divided
• 5 large eggs
• 2 teaspoons vanilla extract
• 1 cup confetti quin sprinkles

For Frosting

• 2 cups (4 sticks) unsalted butter, room temperature
• 3 3/4 cups powdered sugar
• 1/4 cup heavy cream, more or less as needed
• 1 vanilla bean, seeded
• food coloring (optional)

Directions

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