Step 1

Lightly grease a 9x13-inch dish with butter.

Step 2

Line the bottom of the dish with oatmeal pies and use your hands to press them into a solid crust without spaces between. Use pieces of additional sandwiches to fill the gaps if necessary. Set aside.

Step 3

In a large bowl, beat cream cheese until smooth, then add pudding mix and milk. Stir mixture until it thickens, about 1-2 minutes.

Step 4

Fold in Cool Whip just until combined. Do not overmix.

Step 5

Transfer mixture to the baking dish and spread into an even layer.

Step 6

Crumble remaining oatmeal sandwiches on top.

Step 7

Cover tightly and refrigerate for 5-6 hours or overnight to set.

Step 8

Serve chilled.