Prepare and bake Devil's food cake according to package directions for a 9x13 pan.
Remove cake from the oven and poke with the end of a wooden spoon or a straw while still hot. Make many holes. The more holes, the more space for the delicious pudding to hide.
Allow the cake to cool slightly. Meanwhile whisk together Oreo pudding mix with milk. It will be liquidy, but will start to thicken as you whisk. It will take about 2 minutes. When you start to feel resistance allow to stand for 2 minutes.
Pour pudding mix over cake, patting down into the holes. Use a toothpick and prick more holes into the cake and pudding. Tap the whole dish several times to allow the pudding to settle into the cake.
Put Oreo cookies into a large freezer bag and crush with a rolling pin. Or place cookies into a food processor and pulse until cookies are crumbled.
Spread Oreo crumbles over pudding layer and pat down. Cover with aluminum foil and allow to set in the refrigerator for at least one hour. Store refrigerated.
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