Prepare the Dough:
Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy (about 2–3 minutes).
Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
Combine Dry Ingredients:
In a separate bowl, whisk together the flour, baking soda, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the Fruity Pebbles:
Gently fold in the Fruity Pebbles cereal and white chocolate chips (if using) until evenly distributed.
Scoop and Bake:
Use a cookie scoop or tablespoon to drop dough onto the prepared baking sheets, spacing them about 2 inches apart.
Lightly press extra Fruity Pebbles on top of each dough ball for a colorful finish.
Bake for 10–12 minutes, or until the edges are lightly golden and the centers look slightly underbaked.
Cool and Serve:
Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.