Sour Cream Coffee Cake (with Crumb Topping)

Bahan-bahan (9 porsi)

• 2/3 cup (135g) packed dark or light brown sugar
• 3/4 cup (95g) all-purpose flour (spooned & leveled)
• 2 and 1/2 teaspoons ground cinnamon
• 6 Tablespoons (85g) unsalted butter, cold and cubed
• 1 and 1/3 cups (166g) all-purpose flour (spooned & leveled)
• 1 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
• 3/4 cup (150g) granulated sugar
• 2 large eggs, at room temperature
• 2 teaspoons pure vanilla extract
• 1/2 cup (120g) full-fat sour cream, at room temperature*
• 2 Tablespoons (30ml) milk (any kind, dairy or nondairy, is fine)
• 1 cup (120g) confectioners’ sugar, sifted
• 1/2 teaspoon pure vanilla extract
• 2 Tablespoons (30ml) heavy cream or milk