Light and Healthy Tuna Noodle Casserole Recipe

This light and healthy tuna noodle casserole recipe makes six generous servings in about 50 to 55 minutes. It combines whole-wheat egg noodles, tuna packed in water, mushrooms, peas, low-fat milk, Greek yogurt or reduced-fat sour cream, and a modest amount of sharp Cheddar for a creamy dinner without canned condensed soup.

Every forkful is comforting, savory, and satisfying, with a crisp golden topping over tender noodles, flaky tuna, sweet peas, and earthy mushrooms. The from-scratch sauce tastes fresh and rich while remaining lighter than classic casserole versions, making this a practical weeknight meal for the whole family.

Why You’ll Love This Recipe

This casserole has the cozy character of a classic tuna noodle bake, but the sauce is made from everyday ingredients rather than canned condensed soup. Milk, broth, flour, mushrooms, and onion create a savory base with plenty of flavor and a pleasantly creamy texture.

Whole-wheat egg noodles bring more hearty texture, while peas add color and a gentle sweetness. Tuna packed in water keeps the filling light, and sharp Cheddar supplies enough bold cheese flavor that you do not need a large quantity.

The recipe is also easy to fit into a busy schedule. You can prepare the vegetables and sauce while the noodles cook, then assemble everything in one baking dish for a warm dinner that feels generous without being heavy.

If your family enjoys comforting baked dishes for brunch or dinner, you may also like this cozy hashbrown casserole for another easy meal idea.

Ingredients You’ll Need

The ingredient list is straightforward, but each item has a useful role in the finished casserole. Whole-wheat egg noodles provide structure, while the onion, mushrooms, and garlic form the aromatic vegetable base.

• Noodles: Use 8 ounces of whole-wheat egg noodles, cooked just shy of tender.
• Vegetables: One finely chopped yellow onion, 8 ounces of sliced mushrooms, 2 cloves of garlic, and 1 cup thawed frozen peas create a flavorful filling.
• Liquid and thickener: Low-fat milk, low-sodium chicken or vegetable broth, and all-purpose flour make the sauce without condensed soup.
• Protein and creaminess: Two 5-ounce cans of drained tuna and 1/2 cup plain Greek yogurt or reduced-fat sour cream keep the dish satisfying.
• Cheese and topping: One cup reduced-fat sharp Cheddar, plus whole-wheat breadcrumbs or panko mixed with a teaspoon of oil or melted butter, gives the casserole its savory finish.

Choose tuna packed in water and drain it thoroughly before flaking. If you prefer a vegetarian variation, replace the tuna with extra vegetables, but the recipe as written is designed around two cans of tuna.

For another vegetable-forward baked side dish, take a look at this simple carrot casserole. It pairs nicely with a fish-centered dinner when you want an additional colorful dish.

How to Make It Step-by-Step

Step 1: Heat the oven to 375°F (190°C), then lightly coat a 9-by-13-inch baking dish with cooking spray. Setting up the dish first makes assembly quick once the sauce and noodles are ready.

Step 2: Bring a pot of salted water to a boil and cook the whole-wheat egg noodles until they are 1 to 2 minutes shy of the package timing. Drain them well, since excess water can thin the finished sauce.

Step 3: Heat 1 tablespoon olive oil in a large skillet or Dutch oven over medium heat. Add the onion and mushrooms, then cook for 5 to 7 minutes until the onion softens and most of the mushroom moisture has cooked away.

Step 4: Stir in the minced garlic and cook for 30 seconds. The short cooking time releases its aroma while keeping the garlic from becoming bitter or dark.

Step 5: Sprinkle the flour over the mushroom mixture and stir for about 1 minute. Gradually whisk in the low-fat milk and broth, adding them slowly so the sauce stays smooth and lump-free.

Step 6: Simmer the sauce for 4 to 6 minutes, stirring regularly, until it thickens enough to coat a spoon. Add the kosher salt, black pepper, and optional dried thyme, tasting carefully because the broth and tuna may already contain some salt.

Step 7: Take the pan off the heat before adding the Greek yogurt or reduced-fat sour cream. Stir in the yogurt, 1/2 cup Cheddar, drained flaked tuna, thawed peas, and cooked noodles until the ingredients are evenly distributed.

Step 8: Spoon the creamy noodle mixture into the prepared baking dish and spread it evenly. A level surface helps the cheese and crumb topping brown at the same rate.

Step 9: Sprinkle the remaining 1/2 cup Cheddar over the casserole. Mix the whole-wheat breadcrumbs or panko with 1 teaspoon olive oil or melted butter, then scatter the crumbs across the top.

Step 10: Bake uncovered for 20 to 25 minutes, until the edges are bubbling and the center is hot. For extra browning, broil for 1 to 2 minutes at the end, watching closely so the crumbs do not burn.

Step 11: Rest the casserole for 5 minutes before serving. This allows the sauce to settle and makes it easier to scoop neat, creamy portions.

Pro Tips for the Best Texture

Do not cook the noodles all the way to perfect tenderness on the stovetop. They absorb some of the sauce and continue softening during baking, so fully cooked noodles can become overly soft.

The mushrooms should look moist but not watery before you add the flour. If liquid remains in the skillet, continue cooking for another moment; reducing that moisture helps the sauce thicken and keeps the crumb topping crisp.

Add the Greek yogurt or sour cream after removing the pan from the heat. Boiling dairy can cause the sauce to separate, while off-heat stirring gives the casserole a smooth, creamy finish.

Sharp Cheddar works especially well because its full flavor is noticeable in a modest portion. For the topping, panko creates a particularly crisp surface, while whole-wheat breadcrumbs give a slightly more rustic texture.

For a different hearty casserole idea, this comforting biscuits and gravy bake offers another family-style option, though this tuna version is the lighter fish-based choice.

Serving Suggestions

Serve the casserole warm after its five-minute rest, spooning from the center so every portion receives noodles, vegetables, tuna, sauce, and crunchy crumbs. A simple green salad or steamed vegetable balances the creamy bake without adding much preparation.

A squeeze of lemon at the table can brighten the savory sauce, while chopped parsley adds a fresh finish if you have some available. Keep additional seasoning light because the Cheddar, broth, and tuna already provide plenty of savory flavor.

This dish is substantial enough to serve as a complete weeknight dinner. For a sweet finish after dinner, small homemade treats such as these chocolate chip granola bars are easy to portion and pack for the next day.

Storage and Reheating

Cool leftovers promptly, then cover the baking dish or transfer portions to airtight containers. Refrigerate for up to 3 days, keeping the casserole chilled until you are ready to reheat it.

Reheat individual servings gently in the microwave, stirring or rotating halfway through if needed. You can also warm covered portions in a 350°F oven until hot, then uncover briefly if you want to restore some crispness to the topping.

The casserole is best enjoyed fresh because the noodles gradually absorb the sauce during storage. If the leftovers seem dry, add a small splash of milk before reheating to bring back some creaminess.

Light and Healthy Tuna Noodle Casserole

A creamy, from-scratch tuna noodle casserole made with whole-wheat egg noodles, mushrooms, peas, low-fat dairy, and a crunchy breadcrumb topping. This lighter family dinner serves six.

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Prep Time 20 minutes mins

Cook Time 25 minutes mins

Total Time 50 minutes mins

Servings: 6 servings

Ingredients Method Notes

Ingredients

  

Noodles and Casserole

• 8 ounces Whole-wheat egg noodles
• 1 tablespoon Olive oil
• 1 medium Yellow onion, finely chopped
• 8 ounces Mushrooms, sliced
• 2 cloves Garlic, minced

Sauce

• 1/4 cup All-purpose flour
• 2 cups Low-fat milk
• 1 cup Low-sodium chicken or vegetable broth
• 1/2 teaspoon, plus more for pasta water Kosher salt
• 1/4 teaspoon Black pepper
• 1/2 teaspoon, optional Dried thyme

Casserole Filling

• 2 5-ounce cans Tuna packed in water, drained and flaked
• 1 cup Frozen peas, thawed
• 1/2 cup Plain Greek yogurt or reduced-fat sour cream
• 1 cup Reduced-fat sharp Cheddar cheese, divided

Topping

• 1/2 cup Whole-wheat breadcrumbs or panko
• 1 teaspoon Olive oil or melted butter

Method

 

Step-by-Step

1. Heat the oven to 375°F (190°C) and lightly coat a 9-by-13-inch baking dish with cooking spray.
2. Cook the whole-wheat egg noodles in salted water until just shy of tender, usually 1 to 2 minutes less than the package directions. Drain well.
3. Heat 1 tablespoon olive oil in a large skillet or Dutch oven. Add the onion and mushrooms, cooking for 5 to 7 minutes until softened and most of the mushroom moisture has evaporated.
4. Add the minced garlic and cook for 30 seconds, stirring constantly so it becomes fragrant without browning.
5. Sprinkle the flour over the vegetables and stir for about 1 minute. Gradually whisk in the milk and broth to create a smooth sauce.
6. Simmer the sauce for 4 to 6 minutes, stirring often, until thickened. Season with kosher salt, black pepper, and optional dried thyme.
7. Remove the pan from the heat before stirring in the Greek yogurt or reduced-fat sour cream. Add 1/2 cup Cheddar, the drained tuna, thawed peas, and cooked noodles.
8. Transfer the mixture to the prepared 9-by-13-inch baking dish and spread it into an even layer. Sprinkle the remaining 1/2 cup Cheddar over the surface.
9. Mix the breadcrumbs or panko with 1 teaspoon olive oil or melted butter. Scatter the crumbs evenly over the cheese.
10. Bake the casserole uncovered for 20 to 25 minutes, until hot and bubbling. Broil for 1 to 2 minutes at the end if you want a deeper golden topping.
11. Let the casserole rest for 5 minutes before serving. This short rest helps the creamy sauce settle so each portion holds together.

Notes

Undercook the noodles slightly because they continue cooking in the oven. Cook the mushrooms until their excess moisture has evaporated for a thicker sauce and crisper topping. Stir the Greek yogurt in off the heat to help prevent separation. Refrigerate leftovers in a covered container and reheat gently.

Final Thoughts

This light and healthy tuna noodle casserole proves that a comforting baked dinner does not need canned soup or a heavy amount of cheese. Whole-wheat noodles, tender vegetables, flaky tuna, and a from-scratch milk-and-broth sauce create a balanced meal with a golden, crunchy top.

Keep the noodles slightly undercooked, reduce the mushroom moisture, and stir the yogurt in off the heat for the best results. Once you taste how fresh and satisfying this version is, it is likely to become a regular part of your weeknight rotation.

For a seasonal dessert to follow this savory meal, consider serving a small portion of homemade pumpkin pudding. Its smooth texture and warm spice make a pleasing finish after the crisp-topped casserole.