Ingredients

2-3 large ripe bananas, mashed will equal to around 1 cup (approx. 8 oz.)
1-3/4 cups (210 grams) all purpose flour
1/2 tsp. baking soda
2 tsp. baking powder
1/4 tsp. salt or a pinch
1/3 cup (2.6 oz.) softened butter
2/3 cup (133 grams) granulated sugar
2 eggs, room temperature
2 tbsp. milk, room temperature
1/2 cup (64 grams) chopped walnuts for batter + 1/4-1/2 cup walnuts for topping
1 tbsp. quick oats for topping (optional)