Add ¼ of the Cool Whip (about 4 ounces) to the pudding mixture and whisk to combine. Set aside.
16 ounces Cool Whip
To assemble the trifle, place half of the brownies in an even layer on the bottom of the trifle bowl. Sprinkle ⅓ of the crushed Oreos over top of the brownies.
1 package Oreos
Spoon about ½ of the pudding over the Oreo cookies and brownies and smooth out evenly. Add half of the remaining Cool Whip, smoothing it over the pudding layer.
Crumble the remaining brownies over the Cool Whip layer and sprinkle another ⅓ of the Oreos over top of the brownies.
Add the rest of the pudding followed by the remaining Cool Whip, smoothing out each layer.
Notes
Typical brownie mixes use the same amount of water, eggs and oil. If the ingredients on your box are different, follow the instructions on the box.