Classic Crumb Cake

Bahan-bahan (12 porsi)

• butter, (for greasing the pan)
• 2½ cups all purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• ½ teaspoon salt
• 10 tablespoons (1¼ sticks) unsalted butter, (at room temperature)
• 1 cup granulated white sugar
• 3 large eggs
• 1 teaspoon vanilla extract
• 1¼ cups sour cream
• 3 cups all purpose flour
• 1 cup packed light brown sugar
• 1 tablespoon ground cinnamon
• 1½ teaspoons coarse salt ((I used Kosher))
• 1¾ cups (3½ sticks) unsalted butter, (at room temperature)