Spinach and Cheese Quiche

 I haven't made quiche in awhile and today I was just craving it!
It was the first time ( I think ) that my son has had it and
I'm happy that he really liked it.
I'm sure I'll be making it again real soon.

    1 refrigerated pie crust
1 1/2 cups ham, cooked and cubed
1 1/2 cups shredded cheddar cheese
1 1/2 cups frozen spinach, thawed and drained
4 large eggs
1 cup milk
1/2 teaspoon salt
1/2 teaspoon freshly ground black pepper
1 1/2 teaspoons prepared yellow mustard
1/4 cup finely chopped onion

 Preheat oven 375 degrees F.
    Prepare a refrigerated pie crust according to package directions for a one-crust 9" dish. 

Pre-bake the crust for 15 minutes.
    Remove from the oven and fill with ingredients: layer ham, spinach, onions, and cheese in 

the prepared crust.
    In a bowl, combine all the remaining ingredients until blended; then pour this mixture over the 

ingredients in the crust.
        Bake for 45 to 55 minutes or until a knife inserted in center comes out clean.

 Let stand 10 to 15 minutes before serving.