It's up to you!
Depends on what you choose!
Vegetables - really anything you want in any amount you want, but here are some ideas
and on and on - if it fits, it sits (in your quiche)
Enough eggs to provide a good ratio for your veggies and also so that it fills up your pie plate or quiche dish well
Herbs & Spices
Salt & Pepper
Tips & Substitutions
If using mushrooms, be sure to sauté them until the excess moisture evaporates.
If you are using a hardier herb (such as rosemary or sage) or dried herbs, add them with your spices. If you are using fresh herbs that are not as hardy (such as dil, parsley, basil, chives) you can add those at the end to garnish your dish or mix them into the egg mixture with your veggies.
Preheat oven to 350 F.
In a large skillet sauté your veggies and meat with your salt, pepper, herbs, and spices. Make sure to cook these items in the right order so that you don't end up overcooking some things and undercooking others. For example, onions and broccoli take a lot longer to cook than spinach. Generally, the firmer something feels and the larger the pieces you chopped, the longer it takes to cook. If you are worried about the timing feel free to cook everything separately, although it will take longer. Fully cook your meat in this step as well.
Crack eggs into a large bowl and whisk. Don't worry you don't have to be fancy, you can use a fork to whisk.
Add your cooked veggies and meat into the bowl and mix well.
Grease your pie dish and pour your egg mixture in.
Bake at 350 F for 40-45 minutes or until a knife inserted in the center comes out clean. Your time will depend on several factors including how much egg you used and how deep your pie dish is - more egg and a deeper dish leading to longer cooking times.