Tuna Noodle Casserole With Mushrooms

• 3 1/4 cups penne pasta
• 1 tablespoon butter, or more to taste
• 1 1/2 cups sliced fresh mushrooms
• 1 onion, finely chopped
• 1 tablespoon all-purpose flour
• 1 1/4 cups milk
• 1/2 cup frozen peas
• 1/2 cup frozen sweet corn
• 1 (7 ounce) can tuna, drained
• 1/2 (8 ounce) package shredded Cheddar cheese

1. 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.
2. Preheat the oven to 400 degrees F (200 degrees C).
3. 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.
4. Drain penne and fold into the sauce. Spread in a large baking dish.
5. Bake in the preheated oven until cheese is melted and the top is golden, 20 to 30 minutes.

penne pasta, butter, mushrooms, onion, flour, milk, frozen peas, frozen sweet corn, tuna, cheddar cheese

Taken from www.allrecipes.com/recipe/263812/tuna-noodle-casserole-with-mushrooms/ (may not work)