Preheat your oven to 350°F (175°C).
Cook the elbow macaroni according to package instructions until al dente. Drain and set aside.
In a large mixing bowl, combine the drained tuna, frozen peas, 1/2 cup of cheddar cheese, milk, cream of mushroom soup, garlic powder, onion powder, salt, and pepper. Mix well.
Add the cooked macaroni 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 breadcrumbs with olive oil until they are evenly coated. Sprinkle the breadcrumb mixture over the pasta.
Top with the remaining 1/2 cup of cheddar cheese.
Bake in the preheated oven for 25-30 minutes or until the top is golden brown and bubbly.
Remove from the oven and let it cool for a few minutes before serving.