Melt & Mix Butter and Marshmallows together. Either on low on the stove top. Or in 30 second increments in the microwave.
Once melted, add and stir in the green and yellow food coloring. I did a very light/tinted green color for these. But you can add as much or as little depending on how much color you want.
Add and stir in Rice Krispies cereal. Make sure that mixture is evenly distributed.
Spread mixture into pan with greased spatula.
Let treats cool for around 30 mins and then cut and enjoy!