This oven baked 3-ingredient canned pea potato casserole is the kind of practical, comforting dish that comes from making the most of a few pantry staples. It has an old-fashioned thriftiness that feels especially rooted in hard-times home cooking, where canned vegetables, potatoes, and a creamy binder could be turned into something filling and genuinely satisfying. The result is soft, tender potatoes, sweet peas, and a rich, creamy texture with a lightly browned top that makes it feel far more special than its humble ingredient list suggests.
Serve this casserole alongside baked ham, meatloaf, roast chicken, or simple sausage patties if you want to make it part of a larger meal, though it can also stand on its own for a light supper. A crisp green salad, sliced tomatoes, pickles, or buttered toast all bring a nice contrast to the creamy texture, and if you're leaning into the nostalgic feel, a glass of iced tea or cold milk fits right in.
Oven Baked 3-Ingredient Canned Pea Potato Casserole
Servings: 6
Ingredients
4 medium russet potatoes, peeled and thinly sliced
2 cans peas, drained (15 ounces each)
1 can condensed cream of mushroom soup (10.5 ounces)
Directions
1. Preheat the oven to 350°F and lightly grease a medium glass baking dish.
2. Peel the potatoes and slice them thinly so they cook evenly in the casserole.
3. In a large bowl, combine the sliced potatoes, drained peas, and condensed cream of mushroom soup. Stir gently until the potatoes and peas are evenly coated.
4. Spread the mixture evenly into the prepared baking dish, making sure the potatoes are distributed in a fairly level layer.
5. Cover loosely with foil and bake for 45 minutes. Remove the foil and continue baking for 20 to 30 minutes more, or until the potatoes are tender and the top is lightly browned.
6. Let the casserole rest for 10 minutes before serving so the sauce can settle slightly and the portions hold together better.
Variations & Tips
Soup swap: If you don't have cream of mushroom soup, cream of celery or cream of chicken also work well and keep the casserole creamy with a slightly different flavor.
Add seasoning: Even though the original version is very simple, a little black pepper, onion powder, or a few pats of butter on top before baking can deepen the flavor without changing the spirit of the dish.
Slice potatoes thinly: The most important tip is keeping the potato slices fairly thin and even. Thick slices can stay firm in the center, while thin slices bake up tender and absorb the creamy sauce better.
Make it ahead: You can assemble the casserole a few hours ahead, cover it, and refrigerate it before baking. If it goes into the oven cold, add a little extra baking time so the center heats through fully.