In a medium bowl combine melted butter, sugar, and cocoa. Whisk in eggs, cold coffee or water and vanilla extract.
In a small bowl combine flour, baking powder and salt. Gently stir into egg mixture until combined. Stir in mashed bananas and semi sweet chocolate chips. Spread into a lightly greased 2-quart baking dish.
Bake at 375 degrees for 25-30 minutes or until toothpick inserted in the middle comes out clean. Remove from oven and cool on wire rack.
When brownies are cool, make glaze.
In a microwave-safe bowl, combine chocolate chips and peanut butter. Microwave on high for one minute or until chips are melted. Stir until smooth. Spread over cooled brownies.
Sprinkle brownies with Valentine sprinkles, optional.