In a large bowl, whisk together flour, boxed cake mix, baking soda, and salt. Set aside.
In a large bowl using an electric mixer, cream together butter and sugars on medium speed. Add egg and vanilla extract; mix until creamy.
Add flour mixture to wet ingredients; mix just until combined. Do NOT over-mix dough. Fold in mini chocolate chips and sprinkles.
Cover and refrigerate cookie dough for a minimum of one hour. This makes the dough more manageable and helps prevent over-spreading.
Preheat oven to 350F degrees.
Scoop dough into tablespoon balls, or use a #50 disher to scoop balls of dough. Place on an ungreased baking sheet or silicone mat/parchment paper lined baking sheet. Keep dough chilled in between batches.
Bake 10-12 minutes, or until edges are slightly browned. Cookies may be soft in the middle but will set as they cool.
Allow cookies to cool on cookie sheet for 4 minutes, then transfer to a wire rack to cool completely. Eat & Enjoy!
Notes
Chocolate Chip Cake Batter Cookies should be stored in an airtight container and will keep 5+ days.Recipe adapted from Sally's Baking Addiction.