Step 1

Preheat oven to 350°F. Line an 8×8 pan with parchment paper and coat with nonstick spray, set aside.

Step 2

In a large bowl, mix together the cake mix, vegetable oil, milk, and egg with a rubber spatula  until combined. Stir in chocolate chunks.

Step 3

Spread the batter into the prepared pan. Bake for 20 minutes.

Step 4

Allow the brownies to cool completely int he pan before cutting into squares. The center might seem underdone, but as the brownies set, they will be fine!