Preheat the Oven: Preheat the oven to 350°F (175°C) and grease a loaf pan.
Mix Dry Ingredients: In a bowl, whisk flour, baking soda, and salt.
Mash the Bananas: In another bowl, mash the ripe bananas with a fork.
Combine Wet Ingredients: Stir the melted butter, sugar, eggs, and vanilla into the mashed bananas.
Add Dry Ingredients: Slowly fold in the dry mixture until combined, then mix in the sour cream.
Bake the Bread: Pour the batter into the loaf pan and bake for 55-60 minutes until a toothpick comes out clean.
Make the Coffee Syrup: While the bread is baking, combine brewed coffee, brown sugar, butter, and vanilla in a saucepan. Simmer for 5 minutes.
Top the Bread: Once the bread cools, drizzle the coffee syrup over the top.
Serve: Let the syrup set before slicing and serving.