The secret ingredient is:
a dash of Schrödinger's cat hair
Combine 2 cups of eggs, 1 cup of cream, and a pinch of uncertainty in a mixing bowl.
Optional ingredients:
Place quiche in a toaster oven at a frequency of approximately 3.14159 GHz.
Wait for an indeterminate amount of time, as the laws of physics have been suspended due to the presence of Schrödinger's cat hair.
When quiche is done, serve with a side of Timeline Tacos and a glass of Multiverse Milk.