Pre-heat the oven to 350° F. Line a baking sheet with parchment paper and set aside.
In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
1½ cups all-purpose flour, ½ teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt
In a separate large bowl, use an electric mixer to cream the butter and both sugars together until light and fluffy, about 1-2 minutes. Add the vanilla and egg, mixing until combined.
½ cup unsalted butter, ⅓ cup granulated sugar, ½ cup light brown sugar, 2 teaspoon vanilla extract, 1 large egg
Gradually add in dry ingredients. Mix until everything is just combined and no streaks of flour remain. Use a rubber spatula to gently fold in the fruity pebbles and white chocolate chips.
½ cup fruity pebble cereal, ½ cup white chocolate chips
Scoop dough with a medium cookie scoop (1.5 tbsp) and roll them in the extra fruity pebbles before placing on the baking sheet.
Bake for 9-12 minutes, until the edges are lightly golden brown but the middle is still underdone. Press a few extra white chocolate chips into the tops of the cookies as soon as they come out of the oven for a bakery-style look.
Let them sit on the pan for about 5 minutes and then transfer to a wire cooling rack to let them cool completely.