4 tablespoons (1/2 stick) unsalted butter, cut into 6 pieces and softened at room temperature
8 tablespoons (1 stick) unsalted butter, cut into small pieces and softened at room temperature, plus additional butter for greasing the pan and plastic wrap
3/4 cup packed light brown sugar
1 tablespoon ground cinnamon
2 teaspoons pure vanilla extract
2 tablespoons unsalted butter
1 cup confectioners' sugar, sifted after measuring
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