Heavenly Banana Walnut Cream Cake Moist Banana Cake Layered with Fluffy Vanilla Cream and Crunchy Toasted Walnuts Recipe Ingredients: For the Cake: 2 cups all-purpose flour 1 teaspoon baking powder 1 teaspoon baking soda ½ teaspoon salt 1 teaspoon cinnamon (optional) ½ cup unsalted butter, softened ¾ cup brown sugar ¼ cup granulated sugar 2 large eggs 1 teaspoon vanilla extract 3 ripe bananas, mashed ½ cup sour cream or Greek yogurt ½ cup chopped walnuts For the Cream Frosting: 1 ½ cups heavy wh