Ingredients

  • For Topping
  • nonstick vegetable cooking spray
  • 1/2 cup unsalted butter
  • 1 cup golden brown sugar (packed)
  • 3 tablespoons dark corn syrup (Karo)
  • 3/4 cup walnut halves or 3/4 cup walnut pieces
  • For Cake
  • 1 3/4 cups flour
  • 1 teaspoon baking powder
  • 3/4 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 cup unsalted butter, room temperature
  • 1/2 cup sugar
  • 1/2 cup golden brown sugar (packed)
  • 2 large eggs
  • 1 cup mashed very ripe banana (2 to 3 large)
  • 3 tablespoons sour cream
  • 1 tablespoon dark rum
  • 1 teaspoon vanilla extract
  • whipped cream or vanilla ice cream

Method

  • Topping.
  • Spray 8 inch round cake pan with 2 inch high sides with nonstick spray.
  • Bring butter,sugar and corn syrup to boil in medium saucepan, stirring constantly until butter melts:boil for 1 minute.
  • Stir in nuts;spread topping in prepared pan and let cool completely.
  • Cake.
  • Preheat oven to 350 degrees.
  • Sift first four ingredients into medium bowl.
  • Using electric mixer, beat butter and both sugars in large bowl until blended.
  • Beat in eggs 1 at a time, then mashed bananas,sour cream,rum and vanilla.
  • Beat in dry ingredients just until combined.
  • Spoon batter into pan.
  • Bake cake until tester inserted into center comes out clean, about 55 minutes.
  • Cool 15 minutes.
  • Cut around cake and place platter over pan. Holding pan and platter together, turn over.
  • Let stand 5 minutes then gently lift off pan.
  • Cool at least 15 minutes for topping to set.
  • Serve warm or at room temperature with whipped cream or vanilla ice cream.