Tuna Zucchini Noodle Bake

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Low-carb, gluten-free, and completely delicious.

tuna zucchini noodle bake

Do you know what I love about zucchini noodles? Just about everything! They mimic the texture of pasta, they qualify as a serving of vegetables, and they’re super inexpensive at the grocery store! This tuna zucchini noodle bake makes a perfect quick and easy weeknight meal that also packs in the nutrition.

If you’re wondering about baking tuna fish, read on to learn why we love combining tuna with our favorite pasta dishes. When everything gets baked together, the tuna, tomato sauce, and milk come together to make a deliciously savory sauce. And, did we mention it was topped off with a cheesy layer? There’s nothing to hate about that!

Pre-Spiralized Zoodles Or Spiralize Yourself?

Before we get into the tuna fish debate, let’s take a look at the noodles themselves. These days, most grocery stores carry pre-spiralized zoodles. They can be found in the frozen section or packaged in cellophane containers in the produce section. It’s completely convenient to buy these already zoodled noodles, so should you?

First of all, you will certainly pay for convenience. A zucchini costs much less (and yields more noodles) than the zoodled variety. Granted, you’ll have to pay for a spiralizer if you want to do it yourself (we like this model, or this handheld model if you’re short on storage space).

On the other hand, you’ll get fresher noodles when you spiralize yourself. Zucchini has a high water content, and it starts to dry out as soon as it’s cut. It will also begin to lose nutrition, so your body will absorb more nutrients when they’re fresher.

At the end of the day, it’s really up to you. If buying pre-spiralized zoodles is the best way for you to put a home cooked meal on the dinner table, then go for it! If you have a spiralizer and a few extra minutes, then I would recommend spiralizing yourself.

Tuna Fish In a Pasta Dish?

I grew up eating tuna salad straight out of the can. It was an easy (and inexpensive) way for my mother to make lunch for us kids. We almost never ate it for dinner – it was always reserved for white bread sandwiches (or, eaten on lettuce by my mom).

Tuna has gotten a bad wrap over the years for poor fishing practices and high-mercury content. These days, though, doctors and nutritionists agree we should be eating more seafood. Fish is high in omega-3 fatty acids, and both the USDA and American Heart Association recommend at least two to three servings of fish a week.

Canned tuna fish can be healthy – you just need to look for a few important things. Buying light tuna (which is lower in mercury) that is line- or pole-caught is a good start. Then, make sure the can itself is free of BPA-linings. Finally, look for water-packed tuna (which has less calories than the oil-packed kinds).

You might be surprised at how delicious tuna is in a pasta dish. We really think it adds a lot of savory flavor to the casserole, deepening the other flavors. Let us know if you agree after you give it a try – we’d love to know what you think!

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Tuna Zucchini Noodle Bake

Delicious tuna, scrumptious zoodles, and fantastic flavors, this comforting casserole has it all.
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Yield 6 people
Serving Size 1 cup
Course Dinner
Cuisine American


  • 4 zucchini medium, cut into noodles with a spiralizer
  • 2 teaspoons olive oil
  • 1/2 cup yellow onions diced
  • 12 ounces tuna cans, water-packed, drained
  • 1 tablespoon tomato paste
  • 15 ounces diced tomatoes can, drained
  • 1/2 cup skim milk
  • 1 teaspoon dried thyme
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon ground black pepper
  • 1/4 cup parmesan cheese fat-free, grated
  • 1/2 cup cheddar cheese fat-free, shredded


  • Preheat oven to 400 degrees, spray a 9 x 13 inch pan with nonstick spray. Spread the spiralized zucchini in an even layer in the casserole dish. Set aside.
  • In a large skillet, heat the oil, Once hot, add the onion and cook until soft, about 2 minutes. Add the tuna and tomato paste, cook for about 1 more minute. Stir in the diced tomatoes, milk, thyme, salt, and pepper. Bring to a simmer and stir in the parmesan until melted.
  • Pour the tuna mix over the zucchini noodles. Sprinkle with cheddar cheese on top. Bake, uncovered, for 15 minutes or until cheese is melted and bubbly.

Nutrition Information

Serving: 1cup | Calories: 164kcal | Carbohydrates: 10g | Protein: 18g | Fat: 7g | Saturated Fat: 3g | Cholesterol: 34mg | Sodium: 507mg | Potassium: 663mg | Fiber: 2g | Sugar: 7g | Vitamin A: 586IU | Vitamin C: 32mg | Calcium: 201mg | Iron: 2mg |
SmartPoints (Freestyle): 5
Keywords Budget-Friendly, Gluten-Free, Keto, Kid-Friendly, Low-Carb, Quick and Easy, Seafood

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Looking for more faux-noodle dishes? We love our vegetable spiralizer and have all kinds of recipes for zoodles or spaghetti squash noodles. Find them on our Pinterest, Facebook, or Instagram page. Better yet – subscribe to the newsletter to get them delivered to you!



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Chef Nichole

Nichole has a culinary degree from Great Lakes Culinary Institute and has worked in the culinary industry for 10 years. She also has the knowledge to write recipes using the most nutritious, fresh, and balanced ingredients. Nichole enjoys creating healthy and tasty recipes anyone can prepare, no matter their cooking skill level.

More by Chef Nichole


    1. Hi Tonja, fat free and reduced fat parmesan can often be found in the deli and/or specialty cheese department of your store. This vary’s by store and could also be in the dairy department. I would suggest asking an associate at your local grocery store.

    1. Helen, Of course you can. However, I have found that salmon isn’t as tasty as tuna when making casseroles.

  1. Can you use chicken instead? My stepdaughter hates seafood, but I could make half with tuna and half with canned shredded chicken if possible.

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