Healthy Zucchini Tomato Casserole – Zucchini Tomato Onion Casserole

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Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sautéed together. Before serving this zucchini, tomato and onion casserole, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch.

Healthy Zucchini Tomato Casserole Recipe

It’s simple to eat healthier during the summer when garden vegetables are fresh and bountiful. I love combining all that I have in the vegetable drawer and making a tasty garden veggie casserole, which is exactly what drew me into this recipe from my North Carolina Elks Association cookbook.

  • Zucchini
  • Tomatoes
  • Green Peppers
  • Red Onion

All these veggies get sautéed in butter, seasoned with salt and black pepper, and then topped with Parmesan cheese before being finished off in the oven.  When the casserole is bubbling, the vegetables are lightly browned, the cheese is melted, and the kitchen smells heavenly, you’ll know these sautéed Parmesan vegetables are ready to eat.

Zucchini Tomato Onion Casserole

Fresh, garden tomatoes tend to be juicy which result in a delightful saucy zucchini tomato onion casserole. I recommend grabbing some bread and butter and sopping up that juice. (This is exactly how our Grandpa would have eaten it). Or, try serving it over cooked rice which also absorbs the tasty sauce.

But, if you prefer less saucy tomato, onions and zucchini, then go ahead and peel and de-seed the tomatoes before adding to the skillet.

If you have an abundance of tomatoes, try these Broiled Tomato Slices!

Ingredient List for Garden Casserole

Green Peppers, sliced

Onions, diced

Butter

Tomatoes, cut into wedges

Salt

Black Pepper

Parmesan Cheese, shredded

How to Make Zucchini, Tomato and Onion Recipe:

  1. Sauté green peppers and onions in butter until just softened.
  2. Add diced zucchini, and sauté for 5 minutes.
  3. To the skillet, add tomato wedges, and continue to cook for 5 minutes or until tomatoes are soft.
  4. Season generously with black pepper and salt.
  5. Pour into a greased baking dish. Top with shredded Parmesan cheese.
  6. Bake in a preheated 375 degree F oven for 15-20 minutes or until the top browns and the cheese melts.
  7. Let sit for 10 minutes before serving.

For the full recipe steps and ingredient amounts for Sautéed Zucchini and Tomatoes, scroll to the bottom of this post. 

Notes About Healthy Zucchini Tomato Casserole:

  • Substitute white or yellow onions for purple, if desired.
  • Use olive oil to sauté your veggies instead of butter if you wish.
  • If you are looking for a really cheesy zucchini tomato casserole, add extra Parmesan cheese!
  • Be sure to let the zucchini casserole sit on the counter for 10 minutes before serving to let it cool and thicken slightly.
  • The original recipe calls for the tomatoes to be peeled. If you prefer to go this route, go for it!
  • I like the extra liquid in this zucchini onion and tomato bake; however, you can remove the seeds and liquid from the tomato before sautéing. This will result in a thicker casserole.
    • I like to sop up the extra juices with a piece of bread and butter, just like Grandpa would do.  Or, sometimes I serve over cooked rice.

More Zucchini Casserole Recipes:

Old Fashioned Cheesy Zucchini Casserole

With a buttery, crunchy top, this Cheesy Summer Squash and Zucchini Casserole is a perfect side dish. 

Zucchini with Tomatoes and Bacon

Zucchini Tomato Bacon Bake is the a new spin on zucchini casserole.  Chunks of zucchini are baked in a homemade marinara sauce and topped with crispy bacon.

Sour Cream Zucchini Casserole

Sour Cream Zucchini Casserole is an easy side dish that combines a creamy, cheesy zucchini base with a crunchy Ritz cracker topping.

Layered Zucchini Casserole with Ground BeefZucchini Tomato Casserole with Ground Beef is a simple summer garden vegetable bake that is light and fresh without a heavy sauce to weigh you down. Our version features zucchini, onion, corn and tomatoes, but yours can be individualized to your own personal taste. 

Breakfast Casserole with Zucchini

Breakfast is served with this egg casserole full of sausage, cheese, bread cubes and a secret ingredient---zucchini.  That's right, trick your kids into eating their veggies in the morning with this breakfast casserole with zucchini. 

Healthy Zucchini Tomato Casserole - Zucchini Tomato Onion Casserole

Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sautéed together. Before serving this zucchini tomato and onion casserole, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch.
Prep Time5 mins
Cook Time40 mins
Total Time45 mins
Course: Casserole, Side Dish
Cuisine: American
Keyword: garden casserole, garden recipe, garden veggie casserole, healthy zucchini and tomato casserole, healthy zucchini casserole, sauteed parmesan vegetables, zucchini casserole, zucchini recipes, zucchini tomato and onions, zucchini tomato onion casserole
Servings: 6 people
Calories: 137kcal
Author: Barbara

Ingredients

  • 1 red onion, sliced
  • 1 green pepper, sliced in strips
  • 1/4 cup butter
  • 2 cups zucchini, diced in 1-inch pieces
  • 4 medium tomatoes, wedged
  • 1 teaspoon salt
  • black pepper, to taste
  • 1/2 cup shredded Parmesan cheese

Instructions

  • Melt butter in a large skillet; saute onion and peppers until just softened.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 
  • Add diced zucchini and saute for 5 minutes.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 
  • Add the wedged tomatoes, and cook for an additional 5 minutes or until tomatoes soften.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 
  • Pour into a greased baking dish; sprinkle top with shredded Parmesan cheese.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 
  • Bake in a preheated 375 degree F oven for 15 to 20 minutes or until the top begins to brown and the cheese melts.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 
  • Let the casserole sit at room temperature for 10 minutes to cool and slightly thicken before serving.
    Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sauteed together. Before serving, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch. 

Notes

  • Substitute white or yellow onions for purple, if desired.
  • For a dose of healthy fat, use olive oil to saute your veggies instead of butter.
  • If you are looking for a cheesy zucchini tomato casserole, add extra Parmesan cheese!
  • Be sure to let the zucchini casserole sit on the counter for 10 minutes before serving to let it cool and thicken slightly.
  • The original recipe calls for the tomatoes to be peeled. If you prefer to go this route, go for it!
  • I like the extra liquid in this zucchini onion and tomato bake; however, you can remove the seeds and liquid from the tomato before sauteing. This will result in a thicker casserole.
    • I like to sop up the extra juices with a piece of bread and butter, just like my Grandpa would do.
  • We've got plenty of other zucchini recipes including this Ground Beef Zucchini Casserole

Nutrition

Calories: 137kcal | Carbohydrates: 7g | Protein: 5g | Fat: 10g | Saturated Fat: 6g | Cholesterol: 28mg | Sodium: 591mg | Potassium: 374mg | Fiber: 2g | Sugar: 5g | Vitamin A: 1148IU | Vitamin C: 36mg | Calcium: 116mg | Iron: 1mg

Healthy Zucchini Tomato Casserole includes a menagerie of fresh garden veggies sautéed together. Before serving this zucchini tomato and onion casserole, a layer of shredded Parmesan cheese is melted over top for the perfect finishing touch.

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