Bake and cool a flakey quiche crust ahead of time.
When you're ready to make the quiche, preheat oven to 325.
With an electric mixer, whisk together 1 egg and flour on high speed until smooth. Add the remaining 9 eggs and continue mixing until well blended.
Place creme fraiche in a medium bowl and whisk until smooth; add milk and continue whisking until well combined. Mix along with salt, pepper, and thyme until well combined. Strain mixture into a large bowl through a fine mesh sieve.