Step 1

Preheat oven to 350 degrees.

Step 2

Add the melted butter, brown sugar, and granulated sugar to the bowl of a stand mixer and beat until well combined.

Step 3

Beat in the egg and vanilla extract.

Step 4

Dump in the flour, baking soda, and salt. Mix until combined. Dough will be soft.

Step 5

Stir in the dark and white chocolate chips and the sprinkles.

Step 6

Portion dough into 9 large balls of dough.

Step 7

Bake for 11 minutes exactly. Do not overbake. Cookies may look a bit underdone, but they will set up as they cool.

Step 8

Let cookies set on the baking sheet for at least 5 minutes before eating.

Step 9

Store, tightly covered, for up to 5 days.