Pro Tips: For the most vibrant green color, use gel food coloring instead of liquid drops. Toast the pistachios in a dry skillet for 3-4 minutes before chopping to deepen their nutty flavor. Work quickly when combining the cereal—the marshmallow mixture sets fast! For clean, professional-looking cuts, grease your knife with butter between each slice. To prevent soggy treats, store them in an airtight container at room temperature—not the fridge.