Cheddar Zucchini, Tomato, & Onion Gratin

I grew up on this dish. Every summer, my mom would head out to the garden and bring in a huge zucchini and a couple of perfectly ripe tomatoes. She’d slice them up and throw them in a baking dish with some sweet onion, and then she’d top it all with a good amount of grated cheddar. Then she’d bake it until the veggies were tender, the cheddar oozey, the family happy.

Cheddar Zucchini, Tomato, & Onion Gratin | Kitchen Treaty

It seems like such a simple dish (and it is), but I’ve screwed it up an embarrassing number of times. Basically, the pattern goes like this: I forget important details from season to season, fail an attempt (bake it covered, for too long, not long enough …), and then I call my mom once again to ask for directions.

So I’m actually kind of proud that I finally remembered it all on my own this year. And it’s just as I remembered: the dish my mom would whip up every other day come August, a sure sign that we’re smack in the middle of the dog days of summer.

Cheddar Zucchini, Tomato, & Onion Gratin | Kitchen Treaty

And now I’m going to save the recipe for posterity in this here food blog so that I never, ever forget. Yes, I want to share this wonderful little dish with you, but I’m also pretty happy to have it written down for good.

Make it vegan

From time to time, I’ll make a vegan version by skipping the cheddar and drizzling the veggies with a tablespoon or so of olive oil, then dusting with salt and pepper and baking as usual. Also wonderful!

Print Recipe

Cheddar Zucchini, Tomato, & Onion Gratin

The quintessential summer side. Fresh-from-the-garden zucchini, tomatoes, and onions layered and covered with cheddar, then baked until tender and cheesy.

Yield: 4-6

Prep Time: 10 minutes

Cook Time: 30 minutes

Total Time: 40 minutes

Ingredients:

  • 1 large zucchini, sliced 1/4-inch thick
  • 2 large tomatoes, sliced 1/4-inch thick
  • 1 large white, yellow, or sweet onion, sliced 1/4-inch thick
  • 1 cup grated sharp cheddar cheese
  • Salt and pepper to taste
  • Fresh basil for topping/garnish, if desired

Directions:

  1. Preheat oven to 400 degrees Fahrenheit.
  2. In an 8" x 8" baking dish, lay the zucchini, then the onions, then the tomatoes. Top with a pinch of salt and pepper, then sprinkle the cheddar cheese on top.
  3. Bake uncovered for 30 minutes, or until the vegetables are tender and the cheese melted.
  4. Top with fresh basil if desired and serve.

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16 Responses to “Cheddar Zucchini, Tomato, & Onion Gratin”

  1. Hannah @ CleanEatingVeggieGirl posted on August 5, 2013 at 8:08 am

    Okay…this is seriously SO perfect!! Now that zucchinis and tomatoes are pretty much amazing, I am always on the lookout for recipes to use them in. I REALLY want to try making a vegan version of this with Daiya!

    • Karen Troughton replied on August 8th, 2013 on 7:20 am

      Okay, I have no idea what Daiya is! Must find out at once (and let me know how it turns out!)

  2. Maria Tadic posted on August 5, 2013 at 10:51 am

    I think Mom’s love having their kids call and ask them for recipe directions! Maybe on purpose sometimes!!! This looks so good – what is it about veggies topped with a little cheese?! I could eat BOWLS full!!

    • Karen Troughton replied on August 8th, 2013 on 7:20 am

      Definitely – the advent of the internet and the fact you can just ask anything on Google instead of calling mom or dad is actually kind of a sad thing. But we just have to come up with different and better excuses to call! :)

  3. Sinclairika posted on August 5, 2013 at 12:11 pm

    This looks amazing. Yakima Fruit stand here I come so I can make this tonight!

    • Karen Troughton replied on August 8th, 2013 on 7:19 am

      Did you make it again the next night? So glad you liked it. It’s silly because it’s what I do, but it always makes me a little nervous when people try my recipes – especially “real life” friends! :)

      • Sinclairika replied on August 8th, 2013 on 4:51 pm

        I did make it 2 nights in a row. So yummy!
        You shouldn’t be nervous. I’m grateful to have a real life friend who is such a great writer and cook. :)

  4. Anonymous posted on August 12, 2013 at 7:43 pm

    You consistently take the most beautiful food pictures I think I’ve ever seen!

    • Karen Troughton replied on August 16th, 2013 on 8:05 am

      That is such a nice comment – thank you! Especially because I wasn’t very thrilled with how these particular photos turned out, so I doubly appreciate that. ;)

  5. Samantha posted on August 14, 2013 at 3:27 pm

    Just made this tonight for dinner with some rice. It made me realize how much I love cheddar cheese! I love that there aren’t many ingredients and I had everything on hand from the local farmer’s market! Thanks!

    • Karen Troughton replied on August 16th, 2013 on 8:01 am

      Sometimes the simplest recipes are some of the best! Especially with fresh, local ingredients. :) I’m glad you loved it (and yes, cheddar is a weakness of mine!) I have some monster zucchini brewing out in the garden so I’m thinking it’s time for another round of the stuff. Happy summer!

    • Virg replied on September 13th, 2013 on 7:05 pm

      My family has made this for years, but we but rice in the bottom of the baking dish with the appropriate amount of water for cooking the layer the zucchini, onions and tomatoes. I usually slice everything 1/8 inch and sliver the onions and also do as many layers as I can fit in the pan. Cook covered for 45min then uncover and add the cheese and continue to cook until the cheese is bubbly. Sooo good

    • Virg replied on September 13th, 2013 on 7:05 pm

      My family has made this for years, but we put rice in the bottom of the baking dish with the appropriate amount of water for cooking then layer the zucchini, onions and tomatoes. I usually slice everything 1/8 inch and sliver the onions and also do as many layers as I can fit in the pan. Cook covered for 45min then uncover and add the cheese and continue to cook until the cheese is bubbly. Sooo good

  6. goro s アクセサリー posted on August 19, 2013 at 12:18 am

    ビジネスバッグ tumi

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