Cinnamon Streusel Topping – ¾ cup (90 g) all purpose flour – ¼ cup (50 g) light brown sugar – ¼ cup (50 g) granulated sugar – 1 teaspoon ground cinnamon – 6 tablespoons (87 g) unsalted butter, cold and cubed Buttermilk Coffee Cake – 2 cups (240 g) all purpose flour – 2 teaspoons baking powder – ¼ teaspoon baking soda – ½ teaspoon salt – ½ cup (113 g) unsalted butter, room temperature – 1 cup (200 g) granulated sugar – 2 large eggs, room temperature – 1 teaspoon vanilla extract – 1 cup (237 ml) buttermilk, room temperature Vanilla Glaze – 1 - 1½ cups (120 - 180 g) powdered sugar – 2 - 3 tablespoons (30 - 45 ml) milk or heavy cream – 1 teaspoon vanilla extract or vanilla bean paste
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