Muffin Kacang Pisang Vegan untuk Dua Orang

Bahan-bahan (2 porsi)

• 1/2 cup whole-wheat pastry flour
• 1/2 tsp baking soda
• 1 pinch salt
• 1 very ripe banana
• 3 Tbsp brown sugar
• 1 Tbsp vegan butter ((melted // heaping Tbsp is best))
• 1 small flax egg
• 1/2 tsp vanilla extract
• 4 Tbsp whole walnuts for topping