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 and beat until combined.

Mix in baking soda and salt, then slowly add flour and mix just until combined. Scrape sides of bowl during mixing. Gently fold in chocolate chips and sprinkles.

Line a baking sheet with silicone or parchment paper. Scoop 2-tablespoon dough balls onto sheet. Chill for at least 2 hours.

Preheat oven to 350°F. Remove chilled dough and place on cookie sheet, spaced 2 inches apart. Bake for 11-15 minutes until golden edges, tops no longer glossy. Cool for at least 10 minutes before transferring.