Freeze your uneaten quiche for a ready-to-heat meal weeks later. When you are defrosting the quiche, defrost it completely to prevent from overcooking it, which can result in a tough texture and unpleasant taste. Some cooking resources only recommend defrosting the quiche if it was previously cooked; uncooked quiches can go straight into the oven.
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Remove the quiche from the freezer the night before the day you plan to cook the quiche.
Place the quiche in the refrigerator to thaw.
Remove the quiche from the refrigerator the next day and feel with the tip of your finger for any frozen spots. If it still feels frozen in spots allow it to sit in the refrigerator for a couple more hours or microwave the quiche for up to five minutes to thaw it completely.