Layered Cheesy Tuna and Zucchini Casserole

• (6 1/2 ounce) cans chunk tuna (I use all white tuna, but light may be used also, or use both)↗2
• cups wide egg noodles (uncooked)↗4 cups
• celery rib, diced↗1
• green onions, finely chopped↗3
• cup sour cream↗1 cup
• cup mayonnaise↗1 cup
• cup milk↗1⁄4 cup
• teaspoon mustard powder1 teaspoon
• cup grated parmesan cheese1⁄4 cup
• teaspoon dried thyme (rubbed between fingers to release flavor)↗1⁄2 teaspoon
• salt and pepper (I use about 1/2 teaspoon seasoned salt)
• medium zucchini, sliced1
• cups grated mozzarella cheese↗2 cups
• cups grated cheddar cheese↗2 cups
• large firm roma tomato, chopped↗1

Step-by-step instructions

1. 1

   Cook the egg noddles in boiling water according to package directions; drain and rinse under warm water, then set aside.

2. 2

   Drain the tuna and flake with a fork.

3. 3

   In a large bowl, combine tuna, cooked egg noodles, celery and onions; mix well to combine.

4. 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. 5

   Set oven to 350°F.

6. 6

   Grease a 2-quart casserole dish.

7. 7

   Spoon HALF of the mixture into prepared dish.

8. 8

   Top with HALF of the sliced zucchini.

9. 9

   Then sprinkle with cheddar cheese.

10. 10

    Top with noodle mixture then remaining zucchini.

11. 11

    Sprinkle with more grated Parmesan cheese if desired.

12. 12

    Bake covered with foil for 30 minutes.

13. 13

    Remove from oven and uncover, sprinkle with grated mozzarella cheese, return to oven (uncovered) and bake for another 10 minutes.

14. 14

    Sprinkle chopped tomato over casserole before serving.