Skillet Mac and Cheese

I love anything made in one pot/skillet. This is comfort and quick! Isaac made almost the whole dish by himself so, good for little helpers in the kitchen!

3 1/2 cups water
1 can plus 1/2 cup evaporated milk
4 cups pasta of choice (great with sea shell pasta- medium size)
1/2 tsp salt
1 tsp cornstarch
1/2 tsp dry mustard
1 1/2 cups shredded cheddar
1 1/2 cups shredded monterey jack
2 T butter, cut up small
pepper to taste
peas
ham, chopped (see*note)
In large skillet bring water, 1 can milk, pasta, and the salt to boil. Stir often and cook till tender 10-12 minutes. In small bowl whish remaining 1/2 cup milk, cornstarch and mustard. Add to skillet. Simmer a minute or two till thickened slightly. Take off heat and add cheeses. Stir in butter and salt and pepper to taste.
*Add thawed peas and ham*(I sautee ham in a pan to get it golden first, tastes way better)* to top. Can serve it on side or mix in.