The Crucial Tip To Consider For Make-Ahead Tuna Casserole - Tasting Table
Briefly

To prevent a soggy topping on your tuna casserole, reserve the breadcrumb topping separately until just before baking. This keeps it crispy and flavorful.
Toasting breadcrumbs in oil or butter before adding them to your casserole not only improves crunchiness but also enhances their nutty flavor, creating a delicious contrast.
Read at Tasting Table
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