Preheat the Oven and Prepare Baking Sheets

• Preheat your oven to 350°F (175°C).
• Line baking sheets with parchment paper for easy cleanup.

2. Cream Butter and Sugar

• In a large mixing bowl, use a hand or stand mixer to cream together the softened butter and granulated sugar until light and fluffy (about 2-3 minutes).

3. Add Wet Ingredients

• Beat in the egg and vanilla extract until fully combined.

4. Combine Dry Ingredients

• In a separate bowl, whisk together the flour, baking powder, and salt.
• Gradually add the dry ingredients to the wet mixture, mixing just until the dough forms.

5. Fold in Mix-Ins

• Gently fold in the rainbow sprinkles and white chocolate chips until evenly distributed.

6. Shape the Cookies

• Scoop out tablespoon-sized portions of dough and roll them into balls.
• Roll each dough ball in extra rainbow sprinkles for a vibrant coating.
• Place the dough balls on the prepared baking sheets, spacing them 2 inches apart.

7. Bake the Cookies

• Bake for 10-12 minutes, or until the edges are lightly golden but the centers are still soft.
• Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

8. Add Edible Glitter (Optional)

• Once cooled, sprinkle the cookies with edible glitter for an extra magical touch.