Ingredients

• 3 cups whole wheat pastry flour
  
• 2 teaspoons baking soda
  
• 1 teaspoon salt
  
• 1 ¹/₄ cups butter (2 1/2 sticks), at room temperature
  
• ³/₄ cup natural cane sugar
  
• 1 cup brown sugar, tamped down
  
• 4 eggs at room temperature
  
• 3 cups ripe, mashed bananas
  
• 2 teaspoons vanilla
  
• 2 cups walnut, chopped to taste