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Ingredients:

  • * 2 1/4 cup of flour
  • * 1/2 cup of sugar
  • * 1 tablespoon of baking powder
  • * 1/2 teaspoon of baking soda
  • * 1/2 teaspoon of salt
  • * 3 egg yolk
  • * 1/2 cup of sour cream
  • * 1/4 cup of vegetable oil
  • * 1 teaspoon of vanilla extract
  • * 4 ripe banana, mashed (approximately 2 cup)
  • topping
  • * 4 tablespoon of flour
  • * 2/3 cup of brown sugar
  • * 1 teaspoon of cinnamon
  • * 4 tablespoon of butter, melted
  • * 2/3 cup of walnut, chopped (optional)

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