Preheat the oven to 400°F.
Bring a large pot of salted water to a boil, and cook the noodles to al dente (about 1 to 2 minutes less than the package instructions). While the noodles cook, work on the rest of the dish.
16 ounces egg noodles
Heat a large, oven-safe dish over medium heat. Add the mushrooms, butter, garlic powder, salt, celery salt, and pepper. Cook the mushrooms until they shrink in size and soften. They should release some moisture and not be watery, about 5 to 7 minutes.
½ pound mushrooms, 1 tablespoon unsalted butter, ½ teaspoon garlic powder, ½ teaspoon salt, ½ teaspoon celery salt, ⅛ teaspoon ground black pepper
To the sauteed mushrooms, add the cream of mushroom soup and half and half. Mix until well combined and bubbling.
21 ½ ounces cream of mushroom soup, ½ cup half and half
Stir in 1 cup of cheese until melted. Drain the noodles then add those to the pan along with thawed peas and tuna. Combine all the ingredients and top with the remaining 1 cup of cheese.
15 ounces chunk-style tuna, 10 ounces frozen peas
In a small bowl, combine the crushed Ritz crackers and melted butter. Set aside.
1 cup crushed Ritz crackers, 2 tablespoons unsalted butter
Cover the casserole and bake for 20 minutes or until the filling is bubbly. Remove from the oven, uncover and top with the cracker mixture. Bake for an additional 5 to 6 minutes or until the crackers turn golden brown.
Let the casserole cool for 5 to 10 minutes before serving.
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