Position an oven rack in the center of the oven and preheat oven to 350F degrees.
Grease a 9x13-inch baking pan and set it aside. (Or for easy cleanup, line the pan with foil and grease the foil.)
In a large bowl, stir together the dry cake mix, oil, yogurt, and eggs with a wooden spoon until well blended.
Stir in the coconut, and both kinds of chocolate chips.
Spread the cookie batter evenly into the prepared pan. (The batter will be very thick.)
Bake, 15 to 20 minutes, until the bars are just set. (They will still look a little underdone.) Don't overbake or they will be dry and hard.
Remove the pan from the oven and place the pan on a wire rack to cool completely. Cut into 30 bars.
Notes
Serving size: 1 cookie barWW Points: 5Check your WW Points for this recipe and track it in the WW app. (Must be logged into WW on a smartphone or tablet.)5SmartPoints (Green plan)5SmartPoints (Blue plan)5SmartPoints (Purple plan)3PointsPlus (Old plan) I was a little concerned when I took them from the oven because they looked underdone. But once they cooled they were perfectly soft and chewy and not a bit underdone. Don't over-bake them or they will be too dry. It's best to err on the underdone side when baking brownies and bar cookies.