Line a baking sheet with parchment paper (not wax paper). Grease generously with nonstick cooking spray and set aside.
Add marshmallows and butter to a microwave-safe bowl and microwave for 1 minute and 30 seconds or until marshmallows are double in size. Stir well until butter is melted. Pour in cereal and mix well until evenly coated.
¼ cup butter, 10.5 oz mini marshmallows, 5 cup crispy rice cereal
Spread into prepared pan. I usually place a sandwich bag on my hand and spray it with cooking spray. Then you can easily press the mixture into prepared pan. Spread marshmallow cream on top of cereal.
7 oz Marshmallow Fluff
Line the cereal with candy melts. Leave a 1" border around the pan and evenly space out all six colors. Place in the oven for 8 minutes. Remove from oven and use a knife to spread the melted chocolate in a single line in the pan, making sure you don't mix the colors too much. If necessary, wipe the knife after spreading each color. Let set to cool for 15 minutes.
½ cup Red Candy Melts, ½ cup orange candy melts, ½ cup Yellow Candy Melts, ½ cup vibrant green candy melts, ½ cup Blue Candy Melts, ½ cup Bright Pink Candy Melts
Roll up the cereal, jelly-roll style, like a cinnamon roll, starting with the short pink end. As you roll, peel away the parchment paper and pinch the side seams together. Place the roll baking sheet on the long seam and refrigerate for 45 minutes or until candy is set. Cut into 1" slices and serve.