01 - Place Fruity Pebbles cereal in a food processor or zip-top bag. Pulse or crush until finely ground; set aside.
02 - In a large mixing bowl, beat softened butter with an electric mixer on medium speed until creamy and smooth.
03 - Add powdered sugar, 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 - Adjust the consistency by adding more milk for a thinner frosting or more powdered sugar for a thicker spread.
06 - Spread or pipe frosting onto cakes, cupcakes, or cookies. Garnish with additional Fruity Pebbles just before serving for maximum crunch and color.