Ingredients:

• 6 medium baking potatoes, peeled, thinly sliced
• 3 tablespoons butter
• 1 tablespoon olive oil
• 2 cups milk
• 2 tablespoons all purpose flour
• 1 onion, finely chopped
• 1 cup diced ham
• salt and pepper to taste
• 1 teaspoon dried oregano

Preparation:
Melt the butter in a saucepan over low heat. Add salt, pepper and flour. Stir frequently, until you get a smooth mixture, then start adding the milk, little by little. Bring it to boil and cook for about one minute. Set aside.

Oil a baking dish, then arrange one layer of potatoes on the bottom. Cover with half of the chopped onion, add half cup of diced ham, then pour one third of the milk sauce over it. Add a new layer of potatoes, the rest of chopped onion and ham, then cover with the remaining sauce.

Cover the dish and bake it in the oven for about 90 minutes. Uncover, sprinkle with dried oregano, then return to the oven and bake it uncovered for 10 minutes.