Crustless Spinach Quiche

Original recipe found here. 3/4 of my family liked this :)

Ingredients:
1 T vegetable oil
1 onion, chopped
a few cups fresh spinach (or swiss chard), chopped
6 eggs, beaten
1 to 2 cups cheese
1/4 t salt
1/8 t pepper
a few strips bacon, cooked and crumbled (optional)

1. Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9 inch pie pan.
2. Heat oil in a large skillet over medium-high heat. Add onions and cook, stirring occasionally, until onions are soft. Stir in spinach and continue cooking until wilted.
3. In a large bowl, combine eggs, cheese, salt and pepper. Add spinach mixture, bacon, and stir to blend. Pour into prepared pie pan.
4. Bake in preheated oven until eggs have set, about 30 minutes. Let cool for 10 minutes before serving.