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For the Cake:

2 sticks unsalted butter, at room temperature, plus more for the pan

2 3/4 cups all-purpose flour, plus more for dusting

2 teaspoons baking powder

1/4 teaspoon baking soda

1/2 teaspoon salt

1 2/3 cups granulated sugar

4 large eggs, at room temperature

1/2 cup sour cream

1 tablespoon pure vanilla extract

3/4 cup buttermilk

For the Glaze:

2 cups confectioners’ sugar

1 tablespoon fresh lemon juice

1 tablespoon water, plus more if needed

1/2 teaspoon pure vanilla extract

Red, white and blue nonpareils, for topping

Red, white and blue rock candy sticks, for decorating