01 - Place Fruity Pebbles cereal in a food processor or zip-top bag. Pulse or crush until finely ground, then set aside.
02 - In a large mixing bowl, beat the softened butter with an electric mixer on medium speed until creamy and smooth.
03 - Add the powdered sugar gradually, 1/2 cup at a time, beating well after each addition and scraping down the sides of the bowl as needed.
04 - Add the ground Fruity Pebbles, vanilla extract, salt, and milk. Beat on medium-high speed until the frosting is light and fluffy.
05 - Fine-tune the texture by stirring in additional milk for a thinner spread or more powdered sugar for a thicker frosting.
06 - Spread the frosting onto cakes, cupcakes, or cookies. Garnish with whole Fruity Pebbles just before serving for a vibrant crunch.