Blackberry Crumb Cake Recipe from Jessica Seinfeld - Jessica Seinfeld

Ingredients

• Nonstick vegetable oil cooking spray
• For the crumb topping:
• 6 tablespoons dark brown sugar
• ¼ cup granulated sugar
• 1 cup all-purpose flour
• ⅛ teaspoon kosher salt
• 6 tablespoons unsalted butter
• For the cake:
• ½ cup (1 stick) unsalted butter
• 1¾ cups all-purpose flour
• ¾ cup granulated sugar
• 2 teaspoons baking powder
• ½ teaspoon kosher salt
• ¾ teaspoon ground cinnamon
• 2 large eggs
• ¾ cup whole milk
• 1½ teaspoons pure vanilla extract
• 1½ cups fresh blackberries