Here is a quick and easy traditional recipe that I make whenever I want an easy dinner:
Pre-cook the crust in the oven 15 minutes at 400 (so it won't absorb the liquid), putting weight inside to get a flat bottom. I buy ready made, but you can do homemade if you have the courage!
Take the crust out of the oven, let cool a bit. Put whatever filling you like inside: ham & cheese(gruyere), tomato & bacon (pre-dry tomatoes a few minutes in the oven to remove excess water), spinach, leek.
In a measuring cup, crack 3 eggs and add enough heavy cream to fill up to 1 1/2 cup. Mix slightly together, avoid over whipping, you don't want air bubbles in your quiche.
Put back in the oven at 350 for 30-35 minutes.
Enjoy!