How To Reheat A Whole Frozen Casserole - Tasting Table
Briefly

Casseroles are ideal for make-ahead meals, but proper reheating is crucial for food safety and preserving the dish's flavors and textures.
Reheating a frozen casserole is best done by baking it directly from the freezer for twice the original time, ensuring even cooking and preventing a mushy base.
To ensure a successful freezer-to-oven transition, cover the casserole with foil during most of the cooking time and check for an internal temperature of 165°F.
Always cool a casserole before freezing to prevent bacterial growth; using an ice bath can expedite cooling and keep your family safe.
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