I do not make pie crust. I buy Pillsbury roll out crusts. They come 2 in a box and work beautifully. If you make your own, go for it. If you prefer the premade crusts in the aluminum pans, thaw one of those.
Whatever your preference, get your raw crust in a pie pan.
Mix up 2 c. (ish. a little more or less won’t hurt it) of whatever filling makes you happy. Crab, sauteed mushrooms and/or veggies, bacon. It really can be anything that intrigues your taste buds. If you think herbs are good, add the herbs. If you think things go well together, go for it.
Grate 2 c. of a good, melty cheese. I like Gruyere or Jarlsberg. Cheddar is fine, too. But, feel free to try something else that melts well. I don’t care for hard cheeses like Parmesan because they just don’t make that lovely meltiness. And soft cheeses, like Brie and Camembert go the other way making the quiche too loose.
Stir all that together and dump it in the pie crust. Or layer it with the cheese on top.
Whisk together eggs and milk. 1/2 c. milk per egg. Start with 3 eggs and add another one if it looks skimpy. (I usually need a 4th if I’m using a deep dish pan.) You want to cover the filling. a little bit of cheese poking up is OK.
Pop it in the oven at 450ºF for about 30 minutes. (Or follow the directions on your crust.) You want the crust brown and the center to be jiggly, but not liquid. If it looks liquid, give it a few more minutes.
Let it set for 10 or 15 minutes to let the eggs finish cooking. It will be a little puffy when it comes out of the oven. Let it calm down before you cut it.