Potato & Spam Bake

4 medium - Potatoes, unpeeled
3 Tbls - Butter or margarine
1 medium - Onion, chopped
1/2 tsp - Paprika
1/2 tsp - Dry mustard
1/2 tsp - Thyme
1/2 tsp - Celery salt
1/4 tsp - Garlic powder
3 Tbls - Flour
1/2 cup - Cream or milk
1 cup - Cheese (Cheddar or Velveeta), shredded
1 can - Spam, cut in 1/2" cubes
Cracker crumbs

Scrub potatoes, slice and boil 15 minutes in salted water.
Drain, saving 1 cup of potato water.
Arrange sliced potatoes in layers in baking dish.
Melt butter or margarine in skillet.
Brown onion, then add paprika, dry mustard, thyme, celery salt and garlic powder.
Mix with the browned onion.
Add flour to onion mixture, then slowly add reserved potato water and cream or milk.
Cook until thickened.
Add 1/2 cup grated cheese and Spam cubes to the sauce mixture.
Pour over layered potatoes.
Top with remaining grated cheese and cracker crumbs.
Bake in preheated oven at 350 degrees for 30 to 45 minutes.
(Don't tell your guests what's in this dish until after dinner!)