Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a large mixing bowl, cream together the softened unsalted butter and packed brown sugar until light and fluffy.
Step 3: Add the large egg and vanilla extract, beating until well combined.
Step 4: In a separate bowl, whisk together the pudding mix, baking soda, salt, and flour. Gradually add to the wet ingredients, mixing gently.
Step 5: Fold in the white chocolate chips and Fruity Pebbles with a spatula.
Step 6: Drop rounded tablespoons of dough onto a parchment-lined baking sheet, spacing them about 2 inches apart. Bake for 10-12 minutes.
Step 7: Let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
