Note: This dough requires chilling.

Place melted butter in the bowl of a stand mixer fitted with the paddle attachment (or a large bowl if using a hand mixer). Add granulated and brown sugars and mix on low speed until smooth. Mix in egg and vanilla extract until combined.

Mix in baking soda and salt, then slowly add flour and mix just until combined. Scrape sides of the bowl as needed. Fold in chocolate chips and sprinkles.

Line a cookie sheet with a silicone baking mat or parchment paper. Scoop 2 tablespoon sized balls of dough onto the sheet. Chill for at least 2 hours.

Preheat oven to 350°F. Arrange chilled dough balls on a baking sheet, 2 inches apart. Bake for 11-15 minutes until edges are golden.

Cool cookies on the baking sheet for 10 minutes before transferring to a wire rack.