Easy Tuna Noodle Casserole

Preheat the oven to 350 degrees F (175 degrees C).

Bring a large pot of lightly salted water to a boil.

Cook fusilli in the boiling water, stirring occasionally, until tender yet firm to the bite, about 12 minutes.

Meanwhile, melt butter in a saucepan over medium heat.

Whisk in flour, stirring constantly for about 1 minute.

Remove from heat and gradually pour in milk, whisking constantly the entire time to avoid lumps from forming.

Return to heat and cook, stirring constantly, until slightly thickened, about 2 minutes.

Stir in 1/2 of the Cheddar cheese.

Add lemon juice, mustard powder, salt, and pepper and mix well.

Drain fusilli and fold into the sauce.

Pour mixture into an 8-inch casserole dish and sprinkle with breadcrumbs.

Top with remaining Cheddar cheese.

Bake in the preheated oven until cheese is melted and golden, about 30 minutes.