Boston Cream Poke Cake

I made this a few years ago and its become a favorite in our house. When I have to make something for a family gathering if its not a chocolate triffle its this. Its super easy and you can make it the day before. 
This week at work I hosted a family cooking class. I try and include a dessert or 2 and so I thought I would share how to make this. 

You will need;
1 box yellow cake mix 
Ingredients called for on cake mix (eggs, oil and water) 
2 (3.4 oz) boxes instant Vanilla or French Vanilla pudding 
4 cups milk 
1 container chocolate frosting (or your favorite homemade chocolate frosting)
Directions:

Make cake mix according to directions and bake in a well-greased 9×13 pan. 
When cake is finished baking and is still warm, poke holes all over cake using a wooden spoon handle or other similar size object (you want those holes fairly big so the pudding has room to get in there and you need to poke straight through to the bottom of the cake).
In a medium bowl, add milk to pudding mixture and continue to whisk until most of the lumps are removed. Pour pudding on top of warm cake, making sure to pour straight into the holes in the cake.
Take a spoon and spread it evenly across the top of the cake (very gently press down pudding to ensure that pudding goes into the holes and spread it all the way to the sides).
Put cake in fridge and allow to cool completely before adding the frosting (about 2 hours). 
Remove the lid and foil covering from the tub of chocolate frosting and microwave for about 10-15 seconds. Stir frosting with a spoon- it should still be thick, but pourable. Pour chocolate frosting on top of pudding.
Spread frosting to evenly cover cake. Start in the middle and gently spread to the sides. Allow to cool on the counter for a few minutes, then put into the fridge to fully cool and set up.