Spray a 9X13 pan with a non-stick cooking spray and set aside.

Place the butter and marshmallow in a large saucepan and melt butter over low heat stirring frequently.

Once the ingredients are melted and combined, remove from heat. Add in the green gel food coloring until the mixture is a vibrant green coloring.

Gradually stir in the Rice Krispie Cereal.  Mix until the cereal is coated in the marshmallow and butter mixture.

Press the mixture into the 9X13 pan or baking sheet.  I spray a piece of parchment paper with non-stick spray and use that parchment paper to press the cereal down into the baking dish.

Top the Rice Krispie treats with the red heart sprinkles. Make sure to add them throughout the pan so that each treat will have a red heart sprinkle on it.