Preparation Steps

• Preheat your oven to 375°F (190°C). Grease a 9x13 inch baking dish.
• In a saucepan, melt the butter over medium heat. Whisk in the flour and cook for 1 minute, stirring constantly, to create a roux.
• Gradually whisk in the milk until smooth. Bring to a simmer, stirring, until the sauce thickens.
• Remove from heat. Stir in half of the shredded cheese, salt, and pepper until the cheese is melted and the sauce is smooth.
• Layer half of the sliced potatoes in the prepared baking dish. Top with half of the diced ham, then pour half of the cheese sauce over the layer.
• Repeat the layering with the remaining potatoes, ham, and cheese sauce.
• Sprinkle the remaining shredded cheese evenly over the top.
• Cover the baking dish tightly with aluminum foil and bake for 30 minutes.
• Remove the foil and bake for another 15-20 minutes, or until the potatoes are tender and the top is golden brown and bubbly.
• Let stand for 10 minutes before serving.