New York Style Blackberry Crumb Cake | Metropolitan Market

Ingredients

• 2 1/2 cups pastry or cake flour
• 2/3 cup granulated sugar
• 2/3 cup dark brown sugar (packed)
• 1 1/2 teaspoons ground cinnamon
• 1 teaspoon kosher salt
• 3 1/2 cups pastry or cake flour (See Cook's Tips)
• 1 cup granulated sugar
• 1/2 teaspoon baking soda
• 6 ounces unsalted butter (1 1/2 sticks) (cut into 1/2-inch pieces, at room temperature)
• 2/3 cup buttermilk (See Cook's Tips)
• 2 eggs
• 2 egg yolks
• 1 teaspoon vanilla extract
• 2 pints blackberries