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 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 light and fluffy.
05 - Adjust the frosting consistency by adding more milk for a thinner spread or more powdered sugar for a thicker texture, as desired.
06 - Spread or pipe frosting onto cakes, cupcakes, or cookies. Garnish with additional whole Fruity Pebbles just before serving for a colorful crunch.