Bring water, 1 cup evaporated milk and macaroni to simmer in nonstick skillet over high heat, stirring often, until macaroni is tender.
2
Whisk remaining evaporated milk with cornstarch, mustard and garlic powder, then stir into skillet. Continue to simmer until slightly thickened, about 1 minute.
3
Microwave frozen peas approximately 5 minutes, until thawed and slightly warmed, but not cooked. Dice ham.
4
Off heat, stir in cheeses, one handful at a time, adding additional water as needed to adjust sauce consistency. Stir in peas and ham and let sit 5 minutes.
