Melt the butter and mini marshmallows on low heat using either on a stove top or in a microwave. Stir until well mixed.

Remove from heat and add a few drops of black food coloring and mix until color is evenly dispersed.

Pour in cocoa krispie cereal and stir until well coated. Then with oil-coated hands, form little balls.

Break apart chocolate sandwich cookies and scrape off the cream, then break the cookie in half to form two little bat wings. Poke the wings in gently into each side of the ball. 

Add little candy eyes and two chocolate chips for ears. Let the treats cool and harden.