Step 1

Preheat oven to 325 degrees. Grease the bottom of a 9-inch by 9-inch pan. In a large bowl, combine brownie mix, eggs, oil, and water. Pour into greased pan and bake until done, about 40 minutes. Cool. Cut into 1-inch squares.

Step 2

In a large bowl, combine the pudding mix, vanilla, water, and sweetened condensed milk. Mix until smooth, then fold in 8 ounces of whipped topping. Fold until no streaks remain.

Step 3

In a trifle bowl or glass serving dish, place half of the brownies, half of the pudding mixture and 4 ounces of remaining whipped topping. Repeat layers. Garnish with crumbled Oreo cookies. Refrigerate 2 hours before serving.