Layered Cheesy Tuna and Zucchini Casserole

Total Time
1hr 10mins
Prep 30 mins
Cook 40 mins

A family favorite! --- I would recommend to slice the zucchini fairly thick and you may want to add in some chopped green bell pepper also if desired, I have even substituted cooked chicken breast in place of tuna with great success, I like to combine both mozzarella and cheddar cheeses but of coarse one or the other may be used, I also add in 1 teaspoon garlic powder to the sour cream mixture.

Ingredients Nutrition


  1. Cook the egg noddles in boiling water according to package directions; drain and rinse under warm water, then set aside.
  2. Drain the tuna and flake with a fork.
  3. In a large bowl, combine tuna, cooked egg noodles, celery and onions; mix well to combine.
  4. In another small bowl, combine sour cream, mustard powder, mayo, Parmesan cheese, milk, thyme, salt and pepper; add into the tuna mixture and toss well to combine.
  5. Set oven to 350°F.
  6. Grease a 2-quart casserole dish.
  7. Spoon HALF of the mixture into prepared dish.
  8. Top with HALF of the sliced zucchini.
  9. Then sprinkle with cheddar cheese.
  10. Top with noodle mixture then remaining zucchini.
  11. Sprinkle with more grated Parmesan cheese if desired.
  12. Bake covered with foil for 30 minutes.
  13. Remove from oven and uncover, sprinkle with grated mozzarella cheese, return to oven (uncovered) and bake for another 10 minutes.
  14. Sprinkle chopped tomato over casserole before serving.


Most Helpful

Really good! Used yellow onions instead of green. I did like the crunch of the veggies and the lack of cream soup. Also, I used greek yogurt instead of sour cream.

Chele's Corner September 08, 2014

Very good! I love a no cream of soup tuna casserole. I made this as directed but used cream for the milk and used the seasoned salt and garlic powder options. It might be because I'm pregnant but I think I prefer my tuna casseroles just with peas and onion...I wasn't loving the crunchy celery and zucchini flavors. Made for 1-2-3 hit wonders tag game.

Engrossed January 31, 2010

Loved this casserole! This is a creamy, cheesy dish that is pure comfort food! I used my last garden yellow squash in place of zucchini. And took Kitt's advise and added the garlic powder. Just delicious! Thanks Kitt! As usual a winner at my house!

kittycatmom October 02, 2009

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