Grease or line a 9x9” baking pan with wax or parchment paper. Set aside.
In a large saucepan, melt butter over medium heat. Reduce heat to low and stir in 8 cups of marshmallows until smooth.
Remove from heat and quickly stir in Fruity Pebbles and two cups marshmallows.
Pour into prepared pan. Using a butter wrapper, gently press into an even layer. You want them to remain loose so they are soft and chewy. Allow to cool 1 hour. Invert onto a platter or wax paper. Cut into squares to serve.
Microwave Instructions:
Grease or line a 9x9” baking pan with wax or parchment paper. Set aside.
In a microwave-safe bowl, combine 2 tablespoons of butter and 8 cups of the marshmallows. Microwave for 45 seconds, then stir and microwave in 10 second increments until the marshmallow has melted and the mixture is smooth when stirred.
Quickly stir the Fruity Pebbles into the marshmallow-butter mixture, along with the reserved marshmallows.
Pour into prepared pan. Using a butter wrapper, gently press into an even layer. You want them to remain loose so they are soft and chewy. Allow to cool 1 hour. Invert onto a platter or wax paper. Cut into squares to serve.