Scoop cream of mushroom soup over canned tuna, mixed with 3 ingredients, into slow cooker for a classic casserole that disappears faster than anything else

This slow cooker 5-ingredient Amish-style tuna noodle casserole is my streamlined take on the classic church-basement and potluck favorite. It leans into the practical, no-fuss spirit of Amish and Midwestern cooking: pantry staples, minimal prep, and a comforting, creamy finish. The key move—scooping cream of mushroom soup right over canned tuna in the slow cooker—lets everything meld together while the noodles turn tender and the top gets just a bit set around the edges. It’s the kind of casserole that quietly appears on the table and then disappears faster than anything else.

Serve this casserole straight from the slow cooker with a simple green side: steamed green beans, a crisp salad with a tangy vinaigrette, or buttered peas all balance the richness nicely. A basket of soft dinner rolls or sliced country bread is perfect for catching the creamy sauce. If you’d like to round out the meal further, pair it with sliced fresh tomatoes in summer or roasted carrots in cooler months, and finish with something light and fruity for dessert.

Servings: 6

2 (5-ounce) cans tuna in water, drained

Lightly coat the inside of a 4- to 6-quart slow cooker with nonstick cooking spray or a thin film of oil to help prevent sticking.

Scatter the drained canned tuna evenly over the bottom of the slow cooker, breaking it up gently with a fork so it’s in small, bite-size flakes.

Add the frozen peas over the tuna in an even layer. This keeps them from sinking and helps them warm gently as the casserole cooks.

Pour the uncooked egg noodles over the tuna and peas, spreading them out so they form a fairly even layer. Do not stir yet; keeping the layers loose helps everything hydrate evenly.

In a medium bowl or large measuring cup, whisk together the cream of mushroom soup and milk until mostly smooth. You’re looking for a pourable, creamy mixture with no big lumps.

Scoop the cream of mushroom mixture over the tuna, peas, and noodles in the slow cooker, making sure to cover the noodles as much as possible. Use the back of a spoon to gently nudge the mixture around so it seeps down between the noodles, but avoid compacting the layers.

Cover the slow cooker with the lid and cook on LOW for 3 to 4 hours, or until the noodles are tender and the sauce is bubbly around the edges. If your slow cooker runs hot, begin checking at the 2 1/2-hour mark to avoid overcooking the noodles.

Once the noodles are tender, gently stir the casserole from the bottom up to evenly distribute the tuna, peas, and sauce. Taste and season with salt and freshly ground black pepper if desired.

Let the casserole sit, covered and on WARM, for 5 to 10 minutes to thicken slightly before serving. Serve straight from the slow cooker while hot.

To keep the 5-ingredient spirit, think in simple, strategic swaps. For a slightly richer, more old-fashioned texture, replace 1/2 cup of the milk with evaporated milk or half-and-half. If you prefer more vegetables, you can swap the peas for a frozen mixed vegetable blend or use half peas and half frozen corn; just keep the total to about 1 cup so the noodles still cook properly. For a mild flavor twist, use one can of cream of mushroom and one can of cream of celery or cream of chicken soup. If you like a bit of crunch but still want to stay hands-off, sprinkle crushed butter crackers or plain potato chips over each serving at the table instead of baking a topping. To make this ahead, assemble everything in the slow cooker insert, cover, and refrigerate up to 4 hours, then set the insert into the base and start cooking (add about 30 extra minutes if starting from cold). Leftovers reheat well in the microwave with a splash of milk to loosen the sauce; avoid overcooking when reheating so the noodles don’t become mushy.