Heat oven to 350 Lightly spray 24 muffin cups w/ cooking spray. In medium bowl, whisk together flour baking soda. In lg bowl, beat butter, sugar and brown sugar until fluffy.
Beat in 1 egg and vanilla. Beat in flour mix, just until combined. Fold in chocolate chips. Form dough into tbsp sized balls, place on a baking sheet and freeze until hardened, about 2 hrs.
In lg bowl, beat 3 eggs. Add cake mix, water and oil. Beat 2 mins. Spoon batter into muffin cups, 2/3 full. Place a frozen cookie dough ball on top of each cupcake batter. Bake 20 mins. Stick a toothpick into cake batter, not dough and if it comes out clean, they're done. Frost if desired.