Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.

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

Gradually mix in the all-purpose flour until just combined; be careful not to over-mix.

Fold in the Fruity Pebbles gently using a spatula until evenly distributed.

Scoop portions of dough onto the baking sheets, spacing them two inches apart. Bake for 10-12 minutes.

Let the cookies cool on the sheets for 5 minutes before transferring them to a wire rack.

Once cooled, frost each cookie and top with extra Fruity Pebbles for a whimsical finish.