I found this recipe on kalynskitchen.blogspot.com
Golden-brown domes rise three-dimensionally above the muffin tin rim, their surfaces speckled with green onion fragments and slight blistering from the high heat. Baking eggs in individual portions often leads to rubbery edges or watery centers due to uneven heat distribution in small cavities. Achieving a uniform texture requires careful attention to visual cues rather than relying solely on arbitrary kitchen timers.
Proper storage involves transferring cooled portions to an airtight container in the refrigerator for up to four days. Reheating works best in a toaster oven at low heat to restore the exterior crust without toughening the interior.