Spinach Mushroom Quiche

Name: Spinach & Mushroom Quiche
Prep time: 5 min
Cook time: 40 min
Total time: 45 min
Ingredients: 9 " pie shell (partially baked); olive oil; 1/2 onion (diced); 1 package frozen chopped spinach; about 2 cups mushrooms (sliced); salt; pepper; Pinch of nutmeg (nutmeg enhances spinach very nicely); 4 eggs; 1/3 cup milk or heavy whipping cream; shredded cheese (any kind you want)