Quiche

Quiche keeps 3–4 days refrigerated and about 1–2 months frozen. It must be refrigerated — this is a savory egg custard, not a pastry that can sit on the counter.

Cool it to room temperature, then refrigerate within two hours, covered. A whole quiche in a deep dish cools slowly, so cutting it into portions first genuinely helps.

Reheat in an oven at a moderate temperature until the center reaches 165°F. A microwave makes the custard weep and rubbery, since egg proteins tighten and squeeze out water when heated too fast.

Quiche freezes well. Freeze it whole or in slices, wrapped tightly, and reheat from frozen in a low oven. A pre-baked crust freezes better than an unbaked one.

Do not leave a quiche out to serve at room temperature for more than two hours.

Quiche is a custard, which is the important classification. It is a mixture of eggs and dairy, cooked only until just set — and that combination is precisely the one food safety guidance treats with the most caution.

Eggs and cream give a food that is high in protein, high in moisture, and close to neutral in pH, with no acid, salt, or sugar to inhibit anything. Once baked, it also has no competing microflora, so any organism introduced afterwards grows unopposed. The common fillings — bacon, ham, cheese, sautéed vegetables — add moisture and their own contamination risk without adding any preservation.

The pastry crust makes cooling slower by insulating the filling, and the deep dish shape compounds it. A quiche left on a counter to cool "properly" for three hours has spent that time in the bacterial growth range.

Custard's other characteristic is that it weeps as it ages or is reheated too aggressively. Egg proteins that have been overheated contract and squeeze out water, giving you a watery layer under the filling. That is a texture failure rather than a safety signal.

Discard on a sour or sulfurous smell, a slimy surface, mold anywhere including on the crust, or a filling that has separated and gone watery with an off odor.