Banana Bread with Streusel Topping

INGREDIENTS

2 cups

all-purpose flour

3/4 cup

sugar

3/4 tsp

baking soda

1/2 tsp

salt

very ripe, darkly speckled large bananas, mashed well (about 1 1/2 cups)

1/4 cup

buttermilk

large eggs, beaten lightly

6 tbsp

butter, melted and cooled

1 1/2 tsp

vanilla extract

1/2 cup

walnuts, pecans, chocolate chips or shredded coconut (optional)

1/4 cup

all-purpose flour

1/4 cup

sugar

2 tbsp

butter, slightly softened and cut into pieces