Before diving into the step-by-step directions, let me tell you this: the beauty of a tuna casserole lies not just in its taste, but also in how easy it is to prepare. This dish comes together quickly, making it ideal for busy weeknights or last-minute gatherings.

In a large pot, bring salted water to a boil. Add the dry egg noodles and cook according to package instructions until al dente. You want them to have just a bit of bite since they'll continue to cook in the oven. Drain and set aside.

While the noodles are cooking, heat 1 tablespoon of butter in a skillet over medium heat. Add the finely chopped onion and diced celery. Sauté until the onion becomes translucent, about 4-5 minutes. The aroma of onion and celery sizzling in butter is fantastic, trust me!

In a large mixing bowl, combine the drained tuna, sautéed onion and celery, cream of mushroom soup, thawed peas, whole milk, chopped parsley, black pepper, sharp cheddar cheese, and garlic powder. Mix everything together until well combined. This is where the magic starts to happen.

Now that your filling is ready, add the cooked noodles to the mixture. Stir gently to ensure the noodles are evenly coated with that creamy goodness.

In a separate bowl, mix the melted butter with panko breadcrumbs and shredded cheddar cheese. The panko adds a special crunch that I just adore!

Preheat your oven to 350°F (175°C). Transfer the tuna noodle mixture into a greased 9x13 inch baking dish. Top it off with the buttery breadcrumb mixture, spreading it evenly across the top.

Pop your assembled casserole into the preheated oven and bake for about 25-30 minutes, until the top is golden and bubbly. The smell wafting through your kitchen at this moment will make your mouth water.