Cook the egg noodles according to package instructions until al dente. Drain and set aside.
In a large mixing bowl, combine the drained tuna, cream of mushroom soup, milk, frozen peas and carrots, shredded cheddar cheese, chopped onion, garlic powder, and black pepper. Mix well.
Add the cooked noodles to the tuna mixture and stir until everything is evenly combined.
Transfer the mixture to a greased 9x13 inch baking dish.
In a small bowl, mix the crushed potato chips with olive oil to coat them lightly.
Sprinkle the coated potato chips evenly over the top of the casserole.
Bake in the preheated oven for 25-30 minutes, or until the casserole is bubbly and the top is golden brown.
Remove from the oven and let it cool for a few minutes before serving.
Notes
You can substitute the tuna with chicken for a different flavor.