Line cookie sheet with parchment paper.
Add sugars and butter to mixing bowl, and cream together
Add vanilla and egg the mix until combined
Add 2/3 of the chocolate chips, leaving some for the tops of the cookies. Add sprinkles, flour, baking powder & soda, and salt to bowl. Mix until combined. Dough may seem a crumbly but mix 1 minute longer and it will combine.
Scoop dough into balls on parchment lined paper using 1 or 2 inch cookie scoops. Add remaining white chocolate chips to the top of the cookie dough balls.
Chill in fridge for 1-24 hours. The longer it chill the thicker the cookies will be. I recommend 5-12 hours for best results.
Preheat oven to 350 degrees.
Cook cookies for 9-10 minutes for 1 inch cookies and 11-12 minutes for 2 inch cookies.
OPTIONAL: after the cookies cool, drizzle with melted white chocolate or melted candy melts. Melt either option in a heat proof bowl in microwave for 30 second intervals and stir in between to avoid over heating and/or burning.