Combine melted butter, bread crumbs, and parmesan cheese.
Boil the Pasta. Make the fillings.
Whisk flour into the milk then add to the fillings. Simmer to thicken. Add the tuna.
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Add tuna mix to pasta. Top with cheese & breadcrumbs. Bake.
That's it. Super easy & delicious.
BEST TUNA CASSEROLE