Spinach Bacon Quiche (Elin)

4 eggs
2 cups milk
1 1/4 cups shredded cheddar cheese, divided
6 bacon strips, cooked and crumbled
1 small onion, sauted in bacon grease
1 tsp. seasoning salt
1/2 tsp. prepared mustard
1 pkg. frozen chopped spinach, cooked and drained
1 (9 inch) unbaked pastry shell

In a large bowl beat eggs, whisk in milk, 1 cup cheese, onion, bacon, seasoning salt and mustard.  Add spinach.  Pour into pie shell.  Sprinkle with remaining cheese.  Bake at 400 degrees F for 40 minutes or until knife inserted halfway between the center and the edge comes out clean.  Enjoy!!