Preheat the oven to 350°F
Cook egg noodles until just tender, then drain
In a large bowl, mix cream of mushroom soup, milk, tuna, peas, and cooked noodles
Stir in salt and pepper to taste
Transfer the mixture to a greased baking dish
Top with shredded cheese if desired
Sprinkle crushed potato chips or breadcrumbs over the top
Bake for 25 to 30 minutes until hot and bubbly
Let rest for a few minutes before serving