For strict keto, choose an avocado oil or olive oil mayonnaise and a clearly labeled sugar-free Sriracha to keep carbs minimal. You can prepare the eggs up to one day in advance by storing the whites and the yolk filling separately in airtight containers, then piping just before serving for the freshest presentation. Leftover deviled eggs keep well in the refrigerator for up to four days and should not be left at room temperature for more than two hours. If you are sensitive to spice, start with a smaller amount of Sriracha and increase gradually, or add a little extra mayonnaise to soften the heat while keeping the texture rich and creamy.