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Bake brownies per box instructions OR per recipe and cool completely.
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In a large bowl, combine pudding mix and milk. Whisk together well and then chill for 8-10 minutes in the fridge.
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Place Oreos in your food processor and pulse until fine crumbs. You don't want any large pieces.
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Add the finely crushed Oreos to the pudding mixture and combine.
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Fold in Cool Whip until well combined, stirring the least amount as possible.
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Refrigerate for one hour before serving.
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Cut brownies into thin long strips or other desired shape for the base of the Grey Stuff.
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When ready to serve, place the Grey Stuff in a piping bag and add dollops to the top of the brownies and then garnish with sprinkles. OR if you decide not to serve with brownies, create a dollop on plate and swirl around until desired amount and design.