Makes 1 dozen Ingredients For the streusel:3/4 cup (92g) all-purpose flour1/3 cup (66g) light brown sugar, packed1 tablespoon (12g) granulated sugar1 teaspoon cinnamon1/8 teaspoon salt1/4 cup (57g) unsalted butter, meltedFor the muffins:1/2 cup (115g) unsalted butter, softened3/4 cup (150g) ...