Preheat the oven to 350°F and grease a standard loaf pan.
In a large bowl, mash the bananas until mostly smooth. Whisk in the melted butter or oil, sugar, eggs, warmed Biscoff, Greek yogurt or cottage cheese, and vanilla extract.
In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt.
Add the dry ingredients to the wet ingredients and gently fold until just combined.
Pour half of the batter into the prepared loaf pan. Spoon warmed Biscoff over the batter and gently swirl. Add the remaining batter and repeat with more Biscoff on top, if desired.
Bake for 45–55 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10–15 minutes, then transfer to a wire rack to cool completely before slicing.