Cinnamon Swirl Banana Bread with a Streusel Topping

INGREDIENTS

1/2 cup

unsalted butter (room temperature, NOT melted)

1 cup

white sugar

large eggs

and 1/2 teaspoons vanilla extract

1 cup

(~2 medium) overripe bananas (mashed with a fork)

1/2 cup

full-fat vanilla Greek yogurt ((plain sour cream also great))

and 1/2 cups all purpose flour

1 tsp

baking soda (NO BAKING POWDER)

1/2 tsp

salt

Optional: 1/2 cup chopped pecans or walnuts

1/4 cup

brown sugar (lightly packed)

1/2 tbsp

ground cinnamon

1/4 cup

all purpose flour

1/3 cup

brown sugar (lightly packed)

1 tsp

ground cinnamon

1/4 cup

pecans (finely chopped)

2 tbsp

unsalted butter (room temperature)