Every quiche I've made has some type of cheese in it, which would seem
to act as a binder/thickener.

My mom's basic recipe:

pie shell
grated cheeese over the bottom
whatever veggies / meats/ seafood you want
3 eggs whisked with 1 c. whole milk.....sometimes I use my 2% but add a
shot of half-and-half to riichen it

Bake at 375 for 45 minutes.

Let it stand for 5 - 10 minutes befoer serving to set.