Crush the entire package of Oreos. A food processor would work great for this - I don't have one, so I just placed my cookies in a gallon sized Ziplock bag and crushed them with a rolling pin. When the cookies are fine crumbs, transfer them to a large bowl and mix in 6 tablespoons of melted butter. Press the cookie mixture into a 9x13 pan and refrigerate while you prepare the remaining layers.
Next, beat together 1 cup of powdered sugar, the cream cheese, and 1 cup of Cool Whip. Spread over your cookie layer.
For the next layer, mix together the pudding mix, milk, and another 1 cup of Cool Whip. Spread over the cream cheese layer.
Layer the sliced strawberries on top, and spread the remaining Cool Whip on top.