Scallion and Celery Quiche

Directions

1. 1
   Preheat oven to 350 degrees.
2. 2
   Heat oil in a medium skillet over medium heat and add scallions and celery.
3. 3
   Cook, stirring, until celery is just tender, about 5 minutes.
4. 4
   Add a generous pinch of salt, the garlic and thyme, and cook, stirring, until fragrant, about 30 seconds.
5. 5
   Season to taste with salt and pepper.
6. 6
   Remove from heat.
7. 7
   Beat together egg yolks and eggs in a medium bowl.
8. 8
   Set tart pan on a baking sheet to allow for easy handling.
9. 9
   Using a pastry brush, lightly brush bottom of the crust with some of the beaten egg and place in oven for 5 minutes.
10. 10
    Add salt (I use 1/2 teaspoon), pepper, and milk to remaining eggs and whisk together.
11. 11
    Spread scallion and celery mixture in an even layer in the crust.
12. 12
    Stir together cheeses and sprinkle evenly on top.
13. 13
    Very slowly pour the egg custard over the filling.
14. 14
    If your tart pan has low edges, you may not need all of it to fill the shell, and you want to avoid the custard spilling over.
15. 15
    Place quiche, on baking sheet, in the oven and bake for 30 to 35 minutes, until set and just beginning to color on the top.
16. 16
    Remove from oven and allow to sit for at least 10 minutes before serving.
17. 17
    Serve hot, warm or at room temperature.