"If you're looking for a tuna noodle casserole, try this easy recipe with fresh mushrooms, peas, and corn. You can use any kind of pasta or cheese you like. I tend to serve this with a salad and maybe some garlic bread."
Bring a large pot of lightly salted water to a boil. Add penne and cook, stirring occasionally, until tender yet firm to the bite, about 11 minutes.
Preheat the oven to 400 degrees F (200 degrees C).
Meanwhile, melt butter in a large skillet over medium heat and cook mushrooms and onion until softened, about 5 minutes. Stir in flour and cook for 1 minute. Slowly whisk in milk. Add peas and corn. Simmer, stirring occasionally, until sauce thickens, about 5 minutes. Add tuna and 1/2 of the Cheddar cheese and mix to combine.
Drain penne and fold into the sauce. Spread in a large baking dish.
Bake in the preheated oven until cheese is melted and the top is golden, 20 to 30 minutes.