Scalloped Potatoes and Spam Bake

Step 4: Make the Creamy Sauce

Preheat your oven to 375°F (190°C).

In a medium saucepan, melt the butter over medium heat. Once melted, sprinkle in the flour and whisk continuously for about 1 minute.

This creates a simple roux that will thicken the sauce.

Gradually pour in the milk while whisking constantly. Continue cooking and stirring for several minutes until the mixture becomes smooth and noticeably thicker.

Add the garlic powder, onion powder, smoked paprika, and black pepper. Taste the sauce before adding salt because the Spam and cheese already contain a fair amount of sodium.

Remove the saucepan from the heat and stir in 1 cup of shredded cheddar cheese. Continue stirring until the cheese melts into the sauce and creates a smooth, creamy mixture.

Step 5: Assemble the Casserole

Lightly grease a 9×13-inch baking dish.

Begin by arranging a layer of sliced potatoes across the bottom of the dish. Try to keep the slices in a relatively even layer.

Scatter some of the browned Spam and cooked onions over the potatoes.

Pour a portion of the cheese sauce over the layer, spreading it gently so that it reaches as much of the surface as possible.

Repeat the layers:

Potatoes → Spam → onions → creamy sauce

Continue until all of the ingredients have been used, finishing with a layer of sauce.

Sprinkle the remaining 1/2 cup of shredded cheddar cheese evenly over the top.

Step 6: Cover and Bake

Cover the baking dish tightly with aluminum foil and place it in the preheated oven.

Bake for approximately 45 minutes.

Keeping the casserole covered during the first part of baking allows the potatoes to steam and soften while preventing the cheese on top from browning too quickly.

Step 7: Finish Baking Uncovered

After 45 minutes, carefully remove the foil.

Return the casserole to the oven and continue baking for another 20–30 minutes, or until the potatoes are completely tender and the cheese on top is bubbling and golden brown.

To check the potatoes, insert a thin knife or fork into the center of the casserole. It should slide through the potato slices easily.

If the top is browning too quickly before the potatoes are tender, loosely cover the dish again with foil and continue baking.

Step 8: Let It Rest

Once the casserole is finished, remove it from the oven and allow it to rest for approximately 10–15 minutes before serving.

This short resting period allows the creamy sauce to thicken slightly and makes the casserole easier to scoop without the layers falling apart.

Sprinkle with fresh parsley if desired for a little color and freshness.

Helpful Tips for the Best Scalloped Potatoes and Spam Bake

Slice the potatoes evenly. A mandoline slicer can make this particularly easy, but a sharp knife works just as well. Consistent slices are the key to evenly cooked potatoes.

Do not oversalt the sauce. Spam and cheddar cheese are naturally salty, so taste the sauce before adding additional salt.

Brown the Spam first. Although this step is optional, lightly crisping the edges gives the Spam a richer flavor and prevents it from simply becoming soft inside the casserole.

Use Yukon Gold potatoes for extra creaminess. Russet potatoes work beautifully and absorb plenty of sauce, while Yukon Gold potatoes have a naturally buttery texture.

Give the casserole enough baking time. The potatoes should be completely tender before serving. If they are still firm in the middle, continue baking rather than removing the casserole early.

Variations to Try

For a richer casserole, replace 1/2 cup of the milk with heavy cream.

For a smoky version, add a little extra smoked paprika or use smoked cheddar cheese.

For more vegetables, add thinly sliced bell peppers, mushrooms, peas, or spinach between the potato layers.

For a spicy version, add diced jalapeños or a pinch of crushed red pepper flakes to the cheese sauce.

You can also experiment with different cheeses. Monterey Jack, Colby, mozzarella, or a cheddar-Jack blend can all create a deliciously melty topping.

How to Store Leftovers

Allow the casserole to cool before transferring leftovers to an airtight container or covering the baking dish tightly.

Refrigerate for up to 3–4 days.

To reheat, place individual portions in the microwave until hot, or cover the casserole with foil and warm it in a 350°F oven until heated through. If the potatoes seem dry after refrigeration, adding a small splash of milk before reheating can help restore some of the creamy texture.

What to Serve With It

Because this casserole is rich and filling, it pairs nicely with lighter side dishes. A simple green salad, steamed broccoli, roasted green beans, or crisp cucumber salad can provide a fresh contrast to the creamy potatoes and savory Spam.

For a larger comfort-food meal, serve it alongside roasted vegetables or warm dinner rolls.

Final Thoughts

Scalloped Potatoes and Spam Bake is proof that inexpensive ingredients can come together to make something genuinely satisfying. The thin potato slices become tender and creamy, the browned Spam provides savory bites throughout the dish, and the cheddar sauce brings everything together under a golden, bubbling topping.

It is simple enough for a weeknight dinner but comforting enough to deserve a place on a family-style table. With a few easy variations, you can also adapt the casserole to whatever cheese, vegetables, or seasonings you already have available.