#1 Line two cookie sheets with buttered wax paper #2 In a large mixing bowl, combine Marshmallow Fruity PEBBLES cereal with 3 cups of mini marshmallows. Set aside #3 In a large saucepan, melt butter #4 Once butter is melted, slowly add in the remaining marshmallows and mix until smooth #5 Gradually pour the melted butter and marshmallow mixture into the bowl of Marshmallow Fruity PEBBLES cereal a little bit at a time, mixing until cereal is coated evenly #6 Scoop the mixture onto the cookie sheets and spread out until even using damp hands #7 Allow the mixture to harden for about 1-2 hours #8 Cut the mixture using a greased tree-shaped cookie cutter and place onto wax paper #9 Decorate trees with warmed frosting (any color) and top with marshmallow pieces #10 Serve and enjoy! Keep bars in a sealed container to store.