First, turn on the crockpot on high.
Then, make the noodles on the stove top according to the directions on the package. If you'd like to cook the noodles in the crockpot click this recipe for those directions. Once the noodles are done add them into the crockpot.
Next, add in the sour cream, cream cheese and sharp cheddar cheese. Give it a little mix then cover with the lid.
Come back in 30 minutes and mix in the evaporated milk and turn off the crockpot or place it on warm if serving a group.
At one hour, give the crockpot mac and cheese a stir and then serve. If the recipe looks dry, see the tips below.