- In a large saucepan, melt the butter on medium heat.  
- When the butter is melted, add in the marshmallows mixing constantly until melted.  
- Remove from heat and mix in the vanilla and the black food coloring to your desired color. Fold in the Rice Krispie cereal until full combined. 
- Drop by spoonfulls onto a baking sheet lined with wax paper. It doesn’t need to be pretty, it’s coal!