Some dinners are just pure comfort — and this
Slow Cooker Creamy Tuna Noodle Casserole is one of them. Tender pasta, flaky tuna, and savory mushrooms come together in a rich, creamy sauce, all cooked hands-free in the slow cooker.
It’s the kind of meal that feels like a warm hug after a long day, and it’s made with pantry staples you probably already have on hand. The slow cooker does all the work, turning simple ingredients into a cozy, satisfying casserole that the whole family will love.
Prep takes about 10 minutes, the slow cooker does the rest for 5 to 6 hours on LOW, and it serves 4. Perfect for busy weeknights, chilly evenings, or anytime you need a meal that feels like home.
Recipe Card
Slow Cooker Creamy Tuna Noodle Casserole 🍜
Tender pasta, flaky tuna, and savory mushrooms in a rich, creamy sauce — an easy, comforting slow cooker dinner.
Prep Time: 10 minutes |
Cook Time: 5–6 hours on LOW
Servings: 4
Ingredients
- 2 cups 2% milk
- 1 (10.5-ounce) can condensed cream of mushroom soup
- 2 cloves garlic, diced
- 1 (5-ounce) can tuna, drained and flaked
- 1 cup shredded mild cheddar cheese
- 1 cup chopped fresh mushrooms
- 8 ounces uncooked macaroni pasta
- Salt and ground black pepper, to taste
- Nonstick cooking spray
Instructions
- Spray a slow cooker with nonstick spray to coat.
- Combine milk, condensed soup, and garlic in the slow cooker. Stir in the drained, flaked tuna, cheddar cheese, then mushrooms.
- Add the uncooked macaroni, season with salt and pepper, and stir to mix.
- Cover and cook on LOW until the pasta is very soft, 5 to 6 hours. (You can also cook on HIGH for a shorter time, or use a combination of LOW for 3 hours and HIGH for 1 hour, which also works.)
- About 30 minutes before it finishes, raise the lid, give it a stir, and replace the lid — this sometimes helps that last bit of liquid reduce.
- Taste and adjust seasoning before serving.
Why This Recipe Works
The slow cooker cooks the pasta right along with everything else. This is a true one-pot meal — no separate pot of boiling water, no draining, no fuss. The pasta absorbs the creamy sauce as it cooks, becoming soft and flavorful.
The cream of mushroom soup and milk create a rich, creamy base. Together, they form a savory sauce that coats every piece of pasta and tuna, creating that classic tuna casserole texture and flavor.
The cheddar cheese adds a gooey, savory layer. Melted into the sauce, it brings richness and a mild, tangy flavor that pairs beautifully with the tuna and mushrooms.
The garlic and mushrooms add depth without overpowering. Fresh garlic and chopped mushrooms bring a subtle savory note that elevates the dish beyond the basic canned-soup version.
Draining and flaking the tuna keeps the texture right. Unlike the “undrained rounds” approach, draining the tuna and breaking it into flakes ensures it distributes evenly through the casserole and doesn’t water down the sauce.
It’s incredibly hands-off. Ten minutes of prep in the morning, and dinner is ready when you are. It’s the kind of recipe that makes busy weeknights feel manageable.
Pro Tips for Perfect Results Every Time
Use a slow cooker with a reliable LOW setting. The pasta needs the gentle, even heat of LOW to cook through without turning mushy. If your slow cooker runs hot, check the pasta at 4½ hours.
Drain the tuna well. Press it gently with a fork or paper towel to remove excess liquid. Wet tuna will make the casserole watery.
Flake the tuna into small pieces. This ensures it distributes evenly through the pasta and sauce, so every bite gets some tuna.
Stir everything together before cooking. The pasta needs to be mixed into the liquid so it cooks evenly. Don’t just layer it on top.
Season with salt and pepper before cooking. The pasta absorbs the seasoning as it cooks, so it’s important to season the mixture, not just the finished dish.
Raise the lid and stir about 30 minutes before the end. This helps release excess steam and allows the last bit of liquid to reduce, giving you a thicker, creamier casserole.
Check the pasta for doneness, not just the clock. Slow cookers vary. The casserole is done when the pasta is very soft and the sauce is thick and creamy.
Add a splash of milk if it looks dry. If the casserole sits on WARM for a while, it can thicken. A little milk loosens it back up.
Serve hot straight from the slow cooker. This casserole is at its best fresh out of the pot, when it’s creamy and warm.
Store leftovers in the refrigerator. The casserole reheats beautifully and makes a great lunch the next day.
Variations and Substitutions
Use a different pasta. Macaroni is classic, but penne, rotini, or shell pasta all work. Adjust the cook time slightly based on the shape.
Use a different cream soup. Cream of chicken, cream of celery, or cream of mushroom with herbs all work beautifully.
Add vegetables. Frozen peas, corn, or diced bell peppers can be stirred in with the pasta.
Use a different cheese. Monterey Jack, Colby, or a Mexican blend all melt beautifully. For a sharper bite, use extra-sharp cheddar.
Make it gluten-free. Use gluten-free cream of mushroom soup and gluten-free pasta. Verify that all other ingredients are gluten-free.
Make it dairy-free. Use dairy-free cream of mushroom soup, dairy-free milk, and dairy-free cheese.
Add a crunchy topping. Sprinkle crushed crackers or panko breadcrumbs over the top during the last 30 minutes of cooking for a crispy finish.
Make it a tuna rice casserole. Substitute the pasta with 1½ cups of uncooked long-grain white rice and increase the liquid to 3 cups. Cook on LOW for 2½ to 3 hours, until the rice is tender.
Storage and Reheating
Refrigerator: Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheating: The best way to reheat is on the stovetop over medium-low heat, or in the microwave in 1-minute intervals, stirring between each. Add a splash of milk to loosen the sauce if it’s thickened.
Freezer: This casserole freezes reasonably well. Cool completely, transfer to a freezer-safe container, and freeze for up to 3 months. Thaw overnight in the refrigerator, then reheat gently with a splash of milk.
Make ahead: You can assemble everything in the slow cooker insert the night before, cover, and refrigerate. In the morning, place the insert in the slow cooker and cook as directed, adding 30 minutes to the cook time since it starts cold.
Food safety: Since this casserole contains tuna and dairy, don’t leave it at room temperature for more than 2 hours. Refrigerate leftovers promptly.
What to Serve With It
This casserole is a complete meal on its own, but a few sides round it out beautifully:
- A crisp green salad with a tangy vinaigrette
- Steamed green beans or roasted broccoli
- Crusty bread or dinner rolls for soaking up the sauce
- Garlic bread or cheese toast
- A glass of white wine or sparkling water with lemon
- Fresh fruit for a light dessert
Frequently Asked Questions
Can I use a different pasta?
Yes. Penne, rotini, or shell pasta all work. Adjust the cook time slightly based on the shape.
Can I use a different cream soup?
Yes. Cream of chicken, cream of celery, or cream of mushroom with herbs all work beautifully.
Why did my casserole turn out mushy?
The pasta was overcooked, or there was too much liquid. Check the pasta at 4½ hours and raise the lid to let excess steam escape during the last 30 minutes.
Why did my casserole turn out dry?
The pasta absorbed more liquid than expected, or it sat on WARM too long. Stir in a splash of milk before serving.
Can I add vegetables?
Yes. Frozen peas, corn, or diced bell peppers can be stirred in with the pasta.
Can I make this ahead of time?
Yes. Assemble everything in the slow cooker insert the night before, cover, and refrigerate. Cook as directed, adding 30 minutes to the cook time.
Can I freeze this casserole?
Yes, for up to 3 months. Cool completely, transfer to a freezer-safe container, and freeze. Thaw overnight in the refrigerator, then reheat gently with a splash of milk.
Can I make this gluten-free?
Yes. Use gluten-free cream of mushroom soup and gluten-free pasta. Verify that all other ingredients are gluten-free.
Can I make this dairy-free?
Yes. Use dairy-free cream of mushroom soup, dairy-free milk, and dairy-free cheese.
Can I make this a tuna rice casserole instead?
Yes. Substitute the pasta with 1½ cups of uncooked long-grain white rice and increase the liquid to 3 cups. Cook on LOW for 2½ to 3 hours, until the rice is tender.
How long does this last in the refrigerator?
Up to 4 days in an airtight container. Reheat on the stovetop or in the microwave.
Can I double this recipe?
Yes, if your slow cooker is large enough. Use a 6- to 7-quart slow cooker and adjust the cook time slightly.
Final Thoughts
This
Slow Cooker Creamy Tuna Noodle Casserole is everything a comforting dinner should be: creamy, savory, and completely hands-off. The pasta cooks right in the sauce, the tuna and mushrooms add savory depth, and the cheddar brings it all together.
It’s perfect for busy weeknights, chilly evenings, or anytime you need a meal that feels like home. Serve it with a simple side salad and some crusty bread, and dinner is done.
If you make this casserole, I’d love to hear how it turned out. Did you use a different pasta? Add vegetables? Try the rice version? Drop a comment below and let me know — and if you’re planning to make it, save this recipe for your next cozy slow cooker night.
