Ingredients
Equipment
Method
- Preheat the oven to 350°F.
- Line an 18x13-inch rimmed baking sheet with parchment paper.
- Whisk the flour, dry cake mix, baking soda, and salt together in a medium bowl.
- In a large bowl, beat the butter, brown sugar, and granulated sugar until creamy, about 2 minutes.
- Beat in the egg, egg yolk, and vanilla until combined.
- Add the flour mixture and mix just until no dry streaks remain.
- Fold in the chocolate chips and sprinkles.
- Cover the dough and refrigerate for 1 hour.
- Scoop the dough into 2-tablespoon portions, spacing them at least 2 inches apart on the prepared baking sheet.
- Bake in batches for 10–12 minutes, until the edges are set and the centers still look soft.
- Cool the cookies on the baking sheet for 5 minutes.
- Transfer the cookies to a wire rack to cool completely.
- Let the baking sheet cool before baking the next batch.
Notes
Chill the dough for the full hour so the cookies keep their shape. Store in an airtight container at room temperature for up to 4 days; freeze baked cookies for up to 3 months. For a dairy-free variation, use dairy-free butter and chocolate chips and check that the cake mix is dairy-free.
