Throw frozen peas in the slow cooker with 4 other ingredients and you'll get a casserole so creamy and good my family asks for it every week.

 This 5-Ingredient Slow Cooker Tuna Noodle Casserole is one of those cozy, no-fuss dinners that feels like a hug at the end of a long day. Tuna casserole has been a Midwest staple for generations—simple pantry ingredients, a creamy sauce, and tender noodles all baked (or in this case, slow cooked) together into something comforting and familiar. This version leans on canned tuna and peas to keep things budget-friendly and practical, and the slow cooker does the work while you handle homework, activities, or just take a breather. It’s the kind of meal you can throw together in the morning and come home to in the evening, knowing everyone will find something to love in that warm, creamy bowl.

This casserole is hearty on its own, but a simple side or two can make it feel like a full Sunday-style supper. A crisp green salad with a light vinaigrette helps balance the creaminess, and steamed or roasted veggies—like carrots, broccoli, or green beans—add color and extra nutrition. Warm dinner rolls, garlic bread, or even buttered toast soldiers are great for scooping up the creamy sauce (kids love this). If you want to keep it really homey, serve with applesauce or sliced fresh fruit on the side. For busy nights, I often just add a bowl of baby carrots and ranch on the table and call it good—no one complains.

5-Ingredient Slow Cooker Tuna Noodle Casserole

Servings: 6 servings

Ingredients

12 oz (about 6 cups) uncooked egg noodles

2 (10.5 oz) cans condensed cream of mushroom soup

2 cups milk (any kind you like)

2 (5 oz) cans tuna, drained and flaked

1 cup frozen peas (no need to thaw)

Optional but helpful: salt and pepper to taste, nonstick spray or a little butter for greasing the slow cooker

Directions

Lightly grease the inside of your slow cooker with nonstick spray or a little butter to help prevent sticking.

In a large bowl, whisk together the condensed cream of mushroom soup and milk until smooth.

Stir the drained, flaked tuna and frozen peas into the soup mixture until everything is evenly combined.

Add the uncooked egg noodles to the slow cooker. Pour the soup-tuna-pea mixture over the noodles and gently stir to coat all the noodles as evenly as you can. The noodles should be mostly submerged in the sauce.

Cover the slow cooker with the lid and cook on LOW for 2.5 to 3.5 hours, stirring once about halfway through if you’re home. Cook just until the noodles are tender but not mushy. (Slow cookers can vary, so start checking around the 2.5-hour mark.)

Once the noodles are cooked, taste and add salt and pepper if needed. Give everything a gentle stir to redistribute the sauce. If it seems a little thick, you can splash in a bit more milk and stir until it’s as creamy as you like.

Serve warm straight from the slow cooker. If you’d like a bit of crunch on top, you can sprinkle on crushed crackers or potato chips just before serving (kids love helping with this part).

Variations & Tips

• Extra Veggie Boost: If your family doesn’t mind more veggies, stir in a handful of frozen mixed vegetables along with the peas. Corn and carrots work especially well and add pretty color. • Cheesy Version: For cheese lovers, mix 1 to 2 cups of shredded cheddar or Colby Jack into the sauce before pouring it over the noodles. You can also sprinkle a little on top right before serving so it melts into a gooey layer. • Picky Eater Swap: If mushrooms are a no-go, you can use cream of chicken or cream of celery soup instead. For kids who “don’t like” peas, try using just half the amount or swapping in corn, which many little ones prefer. • Crunchy Topping: While the casserole is finishing, crush some buttery crackers or plain potato chips. Right before serving, sprinkle them over individual bowls so the topping stays crunchy. This also lets you skip it for anyone who prefers it plain. • Lighter Option: Use low-sodium soup and 2% or skim milk if you’re watching salt or richness. You can also use tuna packed in water instead of oil. The dish will still be creamy and comforting. • Make-Ahead Tip: You can whisk the soup and milk together, stir in the tuna and peas, and keep that mixture in the fridge for up to a day. In the morning, just add it to the slow cooker with the noodles and turn it on. It’s a nice little head start on a busy day. • Kid Involvement: Let kids help by dumping in the peas, flaking the tuna with a fork, or stirring the sauce. When they help make it, they’re often more excited to eat it—even the green bits!