Preheat oven to 350 degrees F. Lightly spray a 9x13 inch pan with cooking spray.
Stir together cake mix and pudding in a medium sized mixing bowl. Add oil, water, yogurt and eggs and stir to combine. Batter will be thick. Spread in bottom of pan, smoothing to make even.
Bake for 20-25 minutes, being careful to not overbake! (Mine took a little under 20 minutes!) Let cool and cut into bars and enjoy!!