Make pudding: In a large bowl, whisk together pudding mix, milk and sweetened condensed milk. Let set for 5 minutes, stirring often, until mixture has thickened.
Make ganache: In a small saucepan over medium heat, bring heavy cream to a low simmer. Add milk chocolate chips to a medium bowl, then pour hot heavy cream on top. Let sit for 3 minutes, then whisk until chocolate has melted and mixture is smooth. Let cool to room temperature.
Assemble trifles: Add an even layer of chopped Oreos into the bottoms of 4 large mason jars. Top with an even layer of pudding mixture, spread milk chocolate ganache over pudding then dollop Cool Whip on top. Repeat to make another layer of each ingredient.
Refrigerate until ready to serve.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/cadbury-egg-trifles/