Preheat your oven to 350°F. Grease a 1.5 lbs (10x5x3) loaf pan or line it with parchment paper.
In a large bowl, mash the ripe bananas until smooth.
3 large ripe bananas
Stir in the melted butter until well combined.
10 Tablespoons melted unsalted butter
Add the granulated sugar, eggs, vanilla extract, and sea salt. Mix until fully incorporated.
1 cup granulated sugar, 3 large room-temperature eggs, 2 teaspoons vanilla extract, 1 teaspoon sea salt
Stir in the sour cream and biscoff spread and baking soda.
1/2 cup sour cream, 1 teaspoon baking soda, 1/4 cup Biscoff spread
Gradually add the flour, mixing until just combined.
2 cups all-purpose flour
Stir in chopped Biscoff cookies until evenly distributed.
6 roughly chopped Biscoff cookies
Pour the batter into the prepared loaf pan and smooth the top.
Sprinkle the Biscoff streusel topping evenly over the batter.
Bake for 70-75 minutes, or until a toothpick inserted into the center of the bread comes out clean. Note: at the 50 minute mark, loosely cover with foil and continue to bake. this will prevent the top from over browning.
Allow the bread to cool in the pan for 10 minutes before transferring to a wire rack to cool completely.