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.
I would reheat it at 350°F and for as long as it takes to get the food to 165°F. Casserole size and ovens are different, so you should check the food with a thermometer. You want to kill off any vegetative bacteria that might have started to grow.
I would say about 3 hours if your baking it at 275 degrees Fahrenheit.
Reheat a pie in the oven for about 10-15 minutes at 350F until it is heated through.
Reheat quiche in the oven at 350F for about 15-20 minutes, or until heated through.
Depends on the weight of the stuffed chicken. At 350, about 20 minutes per pound, plus 15 minutes. A 3 pound chicken would be 1 hr, 15 minutes. The temperature inside the meat/stuffing should reach 165 degrees F.
Reheat a baked potato in the microwave for about 2-3 minutes, or until it is heated through.
Reheat fish in the oven for about 10-15 minutes at 350F for optimal results.
Reheat quiche in the oven at 350F for about 15-20 minutes for optimal results.
If using a microwave, reheat pieces for approx 1 minute 45 seconds. For a whole turkey, microwave time should be 10 to 20 minutes. If using an oven, preheat to 350 degrees. Heat for approx. 30 minutes.
Reheat a baked potato in the oven for about 15-20 minutes at 350F until it is heated through.
Reheat frozen lasagna in the oven at 375F for about 45-60 minutes, or until heated through.
To reheat a smoked ham for optimal flavor and tenderness, it is recommended to reheat it for about 10-15 minutes per pound at a temperature of 325F.