Creamy Baked Potato and Ham Casserole Step-by-step instructions

Before you start

Before beginning the assembly, ensure the oven is fully preheated to 375°F (190°C). Prepare the potatoes by peeling them and using a mandoline to create thin, consistent slices.

If a mandoline is not available, use a sharp chef's knife to slice them as thinly as possible. Having all ingredients measured and ready to go will streamline the assembly process, ensuring the potatoes do not oxidize or discolor before they are combined with the cheese.

Instructions

Preparation and Slicing

1. 1Prepare the Ingredients
   Preheat the oven to 375°F (190°C). Peel the potatoes and slice them into thin, uniform rounds. Prepare the baking dish by ensuring it is clean and ready for layering.
   Look for The potato slices should be thin and consistent in size.
   Tip Using a mandoline slicer ensures the potatoes cook evenly throughout the casserole.

The potato slices should be uniform in thickness, cleanly cut, and ready for immediate layering to ensure even cooking throughout the entire dish.

Check that the diced ham pieces are cut into neat, bite-sized cubes for balanced distribution across every section, with the baking dish set nearby and ready for quick assembly.

Layering the Casserole

2. 2Assemble the Casserole
   Arrange a layer of the sliced potatoes at the bottom of the glass baking dish. Sprinkle a portion of the diced ham over the potato layer. Repeat these layers until all ingredients are used, finishing with a layer of potatoes and topping with the shredded cheese.
   Look for The layers should be distributed evenly across the surface of the dish.
   Tip Layering the ingredients carefully prevents the potatoes from sticking together in clumps.

The layers should be tightly packed to ensure the casserole holds its shape when served. The cheese must be distributed evenly to ensure it permeates every layer of the potato and ham.

Baking and Finishing

3. 3Bake and Serve
   Cover the baking dish with foil and bake in the preheated oven for 30 minutes. Remove the foil and continue baking for an additional 15 minutes, or until the potatoes are fork-tender and the cheese is bubbly and golden brown. Let the casserole rest for 10 minutes before serving to allow the sauce to thicken properly.
   Look for The potatoes are tender when pierced with a fork and the cheese is melted, bubbling, and golden brown.
   Tip Resting the casserole is crucial for achieving that signature cheese pull.

The casserole is ready when the top is golden brown and the potatoes are soft. It should smell savory and rich, with the cheese having formed a cohesive, bubbling layer over the entire surface.

Common mistakes

A common mistake is slicing the potatoes too thick, which increases the cooking time significantly and can lead to uneven texture. Ensure the slices are thin, roughly 1/8 inch thick, for the best results.

Another error is failing to rest the dish after baking. Without this period, the sauce will be too thin and runny, making it difficult to plate the casserole cleanly while maintaining the desired cheese pull.

How to tell it’s done

The casserole is considered done when the potatoes are fork-tender and can be pierced easily without resistance. The sauce should be bubbling actively around the edges of the dish, and the layer of cheese on top should be melted into a deep golden-brown crust.

Allowing the dish to rest for 10 minutes is essential, as it helps the sauce reach the ideal consistency for serving.