Au Gratin Potatoes with Ham

6 large potatoes, scrubbed & sliced less than 1/4 inch thick
1 cup ham, sliced and diced
6 TBS margarine - you'll probably need more!
1/2 large onion, minced
garlic salt, to taste
3 TBS flour
2 cups milk
2 cups cheddar cheese, grated
5 TBS Parmesan cheese, grated
3 TBS bread crumbs, fine
diced jalapeno peppers, canned, to taste *optional
34 - 38 charcoal briquettes

Slice potatoes 1/4 inch thick or less. Sprinkle with a small amount of garlic salt (the cheeses will provide a good amount of salt). Saute onions
(and any jalapeno peppers you may want to add) in 4 tablespoons margarine until soft.

Blend in flour and make a light colored roux (add 2 more tablespoons margarine if roux is too thick). When roux is a light golden color add milk, bring to a light boil, and simmer until somewhat thickened.

Rub the inside of the 12 inch Dutch oven with more margarine.

Mix in potatoes and cheeses then then sprinkle bread crumbs over the top.

Bake approximately 30-40 minutes using 10-12 coals under the Dutch Oven and approximately 25 coals on top (approximately 400 F).