Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish to prevent sticking.
Bring a large pot of salted water to a boil. Add the egg noodles and cook according to package instructions until al dente, usually around 7-8 minutes. Drain and set aside.
In a large mixing bowl, combine the cream of mushroom soup, milk, garlic powder, onion powder, salt, and pepper. Stir until smooth and well blended. Add the drained tuna, frozen peas, cooked noodles, and half of the shredded cheddar cheese. Mix everything gently until evenly combined.
Pour the mixture into the prepared baking dish, spreading it out evenly. Sprinkle the remaining cheddar cheese on top, then evenly distribute the crushed crackers over the cheese layer.
Place the casserole in the oven and bake for 25-30 minutes or until the cheese is melted and bubbly and the cracker topping is golden brown.
Remove the casserole from the oven and allow it to cool for a few minutes before serving.