Preheat your oven to 350°F (175°C) and prepare baking sheets with parchment paper or non-stick spray.

In a large mixing bowl, cream together softened butter, granulated sugar, and brown sugar until light and fluffy, about 3-5 minutes.

Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.

Gradually add the all-purpose flour to the mixture, mixing gently until just combined.

Fold in the Fruity Pebbles cereal with a spatula until evenly distributed.

Using a cookie scoop, drop spoonfuls of dough onto the baking sheets, leaving space between each cookie. Bake for 10-12 minutes.

Once baked, let the cookies cool on the sheets for 5 minutes before transferring to a wire rack. Top with frosting and additional Fruity Pebbles.