Roti Pisang Krim Asam yang Lembab dan Lezat

Bahan-bahan (2 porsi)

• ⅓ cup minyak sayur
• 1 cup gula pasir
• 2 eggs (lightly beaten)
• 1 ½ cups mashed bananas (about 3 large overripe bananas)
• 1 cup sour cream
• 1 ½ teaspoon ekstrak vanila
• 2 ½ cup tepung
• 2 teaspoons soda kue
• ½ teaspoon garam
• 1 cup chopped walnuts (optional)