Preheat your oven to 350°F (175°C).
Cook the egg noodles according to package instructions until al dente. Drain and set aside.
In a large mixing bowl, combine the drained tuna, frozen peas, sour cream, mayonnaise, cheddar cheese, Dijon mustard, garlic powder, onion powder, salt, and black pepper. Mix until well combined.
Add the cooked egg noodles to the mixture and stir gently until everything is evenly coated.
Transfer the mixture to a greased 9x13-inch baking dish, spreading it out evenly.
Sprinkle the crushed potato chips 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. Garnish with chopped parsley.