There are some old-fashioned potluck recipes that disappear from the table almost as quickly as they arrive. This 3-ingredient tomato soup potato scallop is exactly that kind of dish. My neighbor brought it to a potluck once, and it was gone before anyone could go back for seconds!
Thinly sliced potatoes are layered with sweet onion and creamy condensed tomato soup, then slowly baked until the potatoes become wonderfully tender and the sauce turns bubbling, rich, and savory. The tomato soup works its way between every layer, giving the potatoes plenty of flavor without requiring a complicated sauce or a long ingredient list.
It is simple, inexpensive, comforting, and incredibly easy to make—the kind of humble casserole that feels right at a family dinner, church supper, holiday buffet, or neighborhood potluck.
Why You’ll Love This Tomato Soup Potato Scallop
– Only 3 main ingredients are needed.
– Budget-friendly ingredients make it perfect for feeding a crowd.
– The potatoes become tender and flavorful as they bake in the tomato soup.
– The onion adds a gentle sweet and savory flavor throughout the casserole.
– Everything cooks together in one baking dish, keeping cleanup easy.
– It makes a wonderful make-ahead side dish for busy dinners and gatherings.
Ingredients
6 Medium Potatoes, Peeled and Thinly Sliced
Potatoes provide the hearty foundation of this casserole. As they bake, they absorb the tomato soup and become soft, tender, and full of savory tomato flavor. Choose potatoes that are firm and slice them evenly so they cook at the same rate.
2 Cans Condensed Tomato Soup (10.75 Ounces Each)
The canned tomato soup is the secret to this recipe’s simplicity. It creates the rich, saucy layer between the potatoes while providing tomato flavor without requiring a separate homemade sauce.
1 Medium Onion, Thinly Sliced
Onion adds sweetness, depth, and savory flavor. Thin slices soften beautifully during baking and become almost melt-in-your-mouth tender between the potato layers.
How to Make Tomato Soup Potato Scallop
1. Prepare the Oven and Baking Dish
Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish, preferably glass or another oven-safe casserole dish.
Greasing the dish helps prevent sticking and makes serving the finished casserole easier.
2. Start the First Layer
Spread a thin spoonful of the condensed tomato soup across the bottom of the prepared baking dish.
Add a layer of the thinly sliced potatoes, followed by some of the sliced onion.
3. Build the Layers
Spoon more tomato soup over the potatoes and onions.
Continue layering:
Potatoes → onion → tomato soup
Repeat until all the ingredients have been used, making sure to finish with a layer of tomato soup on top.
Try to distribute the ingredients as evenly as possible so every serving gets plenty of potatoes, onions, and sauce.
4. Bake Covered
Cover the baking dish tightly with aluminum foil.
Bake at 350°F for 1 hour.
Keeping the casserole covered during this first stage traps steam inside the dish, helping the potatoes cook until they are tender and soft.
5. Finish Baking Uncovered
Remove the foil and return the casserole to the oven.
Bake for another 20–30 minutes, or until the potatoes are completely fork-tender and the tomato soup is bubbling around the edges with lightly browned spots on top.
If the potatoes aren’t tender yet, continue baking in short increments until a fork slides easily through the center.
6. Let It Rest
Remove the casserole from the oven and let it rest for approximately 10 minutes before serving.
This short resting period allows the layers to settle and gives the sauce a chance to thicken slightly, making the casserole easier to spoon onto plates.
Pro Tips for Perfect Potato Scallop
Slice the potatoes evenly. Thin, uniform slices are the key to potatoes that cook at the same rate. A mandoline can make this especially easy, but a sharp knife works perfectly well.
Don’t rush the covered baking time. The foil traps moisture and helps the potatoes become tender. Removing it too early can leave the potatoes undercooked.
Check the center, not just the edges. The potatoes around the outside of the casserole may become tender before the middle. Insert a fork into the center to make sure everything is cooked through.
Watch the browning. If the top becomes too dark before the potatoes are tender, loosely cover the dish with foil again and continue baking.
Let it rest before serving. Those extra 10 minutes make a noticeable difference in the consistency of the sauce and help the layers hold together.
Add seasoning if desired. The original three-ingredient combination is wonderfully simple, but if you don’t need to keep it strictly to three ingredients, a little black pepper, salt, or garlic powder can add extra flavor.
Easy Variations
Want to turn this simple side dish into something more substantial? Try adding:
– Browned ground beef for a hearty casserole-style dinner.
– Diced ham for a smoky, savory version.
– Shredded cheese over the top during the final 10–15 minutes of baking.
– Garlic powder and black pepper for additional seasoning.
– Fresh herbs such as parsley or chives for a fresh finish.
Keep in mind that adding ingredients changes the original three-ingredient recipe, but these variations can turn it into a satisfying main course.
What to Serve With Tomato Soup Potato Scallop
This cozy potato casserole is especially good alongside classic comfort-food favorites.
Serve it with baked ham, meatloaf, pork chops, roast chicken, or roasted beef for a hearty family dinner.
For vegetables, try buttered green beans, sweet corn, roasted carrots, or crisp cabbage slaw. The freshness of the vegetables balances the rich tomato flavor beautifully.
For a potluck or buffet, add warm dinner rolls, sliced crusty bread, or homemade biscuits. They’re perfect for scooping up every bit of the flavorful tomato sauce.
Frequently Asked Questions
Can I prepare this casserole ahead of time?
Yes. You can assemble the layers ahead of time and keep the covered dish refrigerated until you’re ready to bake. For the best results, allow a chilled baking dish a little extra time in the oven and check the potatoes for tenderness before serving.
How do I know when the potatoes are done?
The easiest test is to insert a fork into the center. The potatoes should be completely tender, with the fork sliding through without resistance.
Why are my potatoes still firm?
The slices may be too thick, or the casserole may simply need additional baking time. Cover it again with foil and continue baking until the potatoes are tender.
Can I use a different type of potato?
Yes. Most standard baking or all-purpose potatoes work well. The most important thing is to slice them thinly and evenly.
A Simple Old-Fashioned Side Dish Worth Sharing
This oven-baked tomato soup potato scallop proves that you don’t need a long ingredient list to make something people remember. With just potatoes, condensed tomato soup, and onion, you get a bubbling casserole filled with tender potatoes, sweet onion, and rich tomato flavor.
It’s inexpensive enough for a weeknight, comforting enough for Sunday dinner, and easy enough to bring to a church supper or potluck. Best of all, it requires very little hands-on work—the oven does most of the cooking for you.
If you love easy potato casseroles, old-fashioned comfort food, budget-friendly recipes, and simple 3-ingredient dishes, this is one recipe you’ll want to keep in your recipe box.