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Since it is already precooked, all you really want to do it to reheat it. Cooking it for too long will begin to overcook the casserole. The time t will take to reheat can varry greatly based on the size, how solid frozen it is, method of heating (oven vs. microwave, for example) and the ingredients used. Small (single or 2 person) dishes might take 10 to 20 minutes in the stove on a modest heat setting, while large ones could take 30 to 45 minutes to reheat in the oven.

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15y ago

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