Cinnamon Walnut Sour Cream Cake Recipe from Jessica Seinfeld - Jessica Seinfeld

Ingredients

• Nonstick vegetable oil cooking spray
• For the topping:
• ¼ cup unsalted butter
• 1 cup walnuts
• ⅓ cup packed dark brown sugar
• 1½ teaspoons ground cinnamon
• ½ teaspoon ground cardamom
• For the cake:
• ½ cup unsalted butter, at room temperature
• ¾ cup granulated sugar
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 1¾ cups all-purpose flour
• ¾ teaspoon baking powder
• ¾ teaspoon baking soda
• ¼ teaspoon kosher salt
• ½ cup sour cream