Tomato and Zucchini Casserole With Crisp Cheddar Topping

Tomato and Zucchini Casserole With Crisp Cheddar Topping
Andrew Scrivani for The New York Times
Total Time
1 hour
Rating
4(520)
Notes
Read community notes

This casserole is a modern twist on an old favorite, the tomato-zucchini bake. But instead of a Parmesan and bread-crumb topping, this one is covered in a savory oat and Cheddar crumble that crisps and browns in the oven. Dollops of garlicky, herbed ricotta make the casserole wonderfully rich and creamy, while olives liven it up with their salty tang. This is equally good warm or at room temperature, preferably served within four hours of baking so the topping stays crunchy. Or you could make it the night before and reheat it in a 375-degree oven until bubbling. It makes an excellent side dish or meatless main course.

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Ingredients

Yield:8 servings
  • 5tablespoons cold unsalted butter, cubed, more for buttering casserole dish
  • cups whole milk ricotta
  • ½cup fresh basil or mint leaves
  • 2garlic cloves, finely grated or minced
  • pounds tomatoes, cut into 1½-inch wedges
  • 1pound slim zucchini, thinly sliced
  • 1teaspoon fine sea salt, more as needed
  • ½cup high-quality pitted black olives, roughly chopped
  • ½cup all-purpose flour
  • ½cup rolled oats
  • ½cup shredded Cheddar cheese
  • teaspoons fresh chopped oregano or marjoram
  • ¾teaspoon finely grated lemon zest
  • Pinch cayenne pepper
  • Extra-virgin olive oil, as needed
Ingredient Substitution Guide
Nutritional analysis per serving (8 servings)

290 calories; 20 grams fat; 10 grams saturated fat; 0 grams trans fat; 8 grams monounsaturated fat; 1 gram polyunsaturated fat; 21 grams carbohydrates; 3 grams dietary fiber; 5 grams sugars; 9 grams protein; 463 milligrams sodium

Note: The information shown is Edamam’s estimate based on available ingredients and preparation. It should not be considered a substitute for a professional nutritionist’s advice.

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Preparation

  1. Step 1

    Heat oven to 400 degrees and butter a 9- by 13-inch casserole dish or 2-quart gratin dish.

  2. Step 2

    In a food processor or blender, purée the ricotta, basil and garlic.

  3. Step 3

    Toss tomatoes, zucchini and 1 teaspoon salt in casserole to combine, then spread into an even layer. Dollop with ricotta mixture and scatter olives evenly across the top.

  4. Step 4

    In a medium bowl, combine flour, oats, cheese, oregano or marjoram, lemon zest, cayenne and a large pinch of salt. Use your fingertips to work in the 5 tablespoons butter; you should end up with small clumps. Scatter clumps over vegetables, then drizzle liberally with olive oil.

  5. Step 5

    Bake until golden and bubbly, 35 to 45 minutes. Serve warm or at room temperature.

Ratings

4 out of 5
520 user ratings
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Cooking Notes

I'd go with olive oil rather than butter, and stick to traditional Parm and breadcrumbs. Different doesn't equal better.

Good but watery. Will salt the vegetables in a separate bowl first next time and let them release some of their liquid before transferring to baking dish.

Theresa, my thoughts exactly. Substituting capers for the black olives is another option.

And were I using the author's mint (versus basil), I'd likely omit the olives (or capers). If salt is desired in a mint-oriented recipe, consider adding some feta cheese to the mix (can reduce ricotta.)

After reading many of the notes, I decided to salt the tomatoes and let them drain in a colander while I prepared the rest of the ingredients. I substituted 1/2 c. chopped capers for olives, and used fresh oregano. I found it difficult to purée the (part skim) ricotta, basil, and garlic in a blender (too thick). I may use a food processor next time. The casserole wasn't too runny -- it was just right! Husband and son-in-law gave it high ratings. I'll make this again!

I had the same experience as a few others -- very watery. We also used whole milk ricotta. We liked the flavor a lot, so if we try it again we might toss in a cup of rice.

To reduce a watery result, try seeding the tomatoes and simply don't put the ricotta in the blender.

I roasted the vegetables. Then proceeded with the recipe. Seemed to solve the water issue. And I think it added flavor.

Oh my, delicious! Added one cup rice, under tomatoes on top of zucchini and chopped onions. Subbed capers for the olives. Added extra cheese to topping. Drained tomatoes on paper towels, salted veggies as they drained. Sliced rounds of tomatoes and zucchini. Cooked a bit longer, about 15 minutes.

Hmmmm... I thought this was underwhelming. My husband, however, had seconds. If I make it again, I'll add onion and either more cheddar or add parmesan. I agree it was a little soggy, and I did use good ricotta. This also made enough to feed an army.

Substituted feta for ricotta and olive oil for butter (as others suggested). Roasted the zucchini slices for 25 minutes ahead of full bake. Will make again!

I took the advice of a few commenters and made sure to salt the zucchini and tomatoes separately in bowls before adding to the casserole dish. I also seeded the tomatoes. Once salted I let them sit to release some of the juices and then dried them as I added them to the casserole dish. No issues with this being watery at all! It was perfect. Very different and very tasty.

Olive oil is great, but if you sub it in this recipe the consistency of the streusel like topping will be different...probably still delicious though :)

A soggy mess!

Thank you. It's allways helpful when olive oil serves as a good substitute for butter.

This landed in my "recipes you would like" just today. Tried it - and certainly liked it! Very nice!! It's a bit moist (I used cherry tomatoes, which have less seeds and stuff) but the liquid is very tasty. So next time I will put a layer of oats/ricotta-lemon ravioli/other pasta as a first layer to soak up all that goodness. Came together in 15 minutes. I mixed the ricotta/basil/garlic with a fork to prevent it from getting to liquid. Made four servings, just about enough for my wife and me...

As others have suggested, the dish is somewhat watery. We ate it with some good sourdough bread to soak up the juice - delicious!!

I wish I had read the comments. Putting the ricotta in the blender liquefied it and turned the whole thing into soup. Awful.

I was thinking I should use plum/Roma tomatoes to make it less liquidy but I didn’t. There was a lot of liquid, and some of the zucchini were still a little solid to the tooth. My daughter suggested for next time baking the zucchini ahead of time to get rid of some of the liquid. I loved it! I get to take all the leftovers for lunch during the week!

Thanks to all the notes, I roasted the veggies first to prevent excess water then followed the recipe using mint. Also added feta + the ricotta mixture, and what came out was a delicious creamy flavor with the right amount of oat crunch. Will definitely make again.

I make this recipe every summer! I’ve found that salting the tomatoes and zucchini as others have suggested is the way to go. This time I salted generously and left in the colander/bowl for about an hour on the counter, stirring every now and then to encourage the water to release. Also, this time instead of adding the basil to the food processor, I chopped it and mixed it in afterwards because sometimes it turns my ricotta green in the food processor. Loved it!

As some have mentioned, very watery. Tasted much better reheated next day

I didn't read the reviews before making this or I might have skipped it. Unlike some I didn't end up with a soggy mess, but I made modifications: added white beans to bulk it up some and used pattypan squash vs. standard zucchini as I have an overabundance of pattypan right now. I think pattypan may be less watery than zucchini. The delicate flavor and texture of the crumb topping against the ricotta is what made it a winner for me. It was better the second day. It does make a ton.

Salt and drain vegetables. Roast veg first, then proceed. Bread crumbs and parm is just as good. Maybe capers instead of alive.

This was good, the ricotta puree gave it an important kick. Can substitute pesto for fresh basil Can use any combination of corn, tomatoes, summer squash, and zucchini. Can substitute crust for breadcrumbs and cheese dotted with butter.

I was underwhelmed with the flavors although I did not have any problems with watery vegetables. If I make it again I would change the topping. I did not like the rolled oats combination.

I didn’t like this too much; felt gooey with the ricotta mix

This was extremely watery, and I regret not reading the notes first. I would make it again, but I would salt the vegetables, let them reduce their water content, and then roast before topping and just broil the top for crispness. The ricotta mixture is delicious, and I may use it for other applications.

I took the advice of a few commenters and made sure to salt the zucchini and tomatoes separately in bowls before adding to the casserole dish. I also seeded the tomatoes. Once salted I let them sit to release some of the juices and then dried them as I added them to the casserole dish. No issues with this being watery at all! It was perfect. Very different and very tasty.

We're usually big fans of Melissa's recipes, but this was completely unsuccessful. We could identify no redeeming qualities, and the preparation is considerable to boot: you're using the food processor *and* working butter into an oat topping with your hands. Perhaps if the recipe title hadn't included the word "crispy" we'd have been less disappointed; crispy it was not. A rare miss from Melissa.

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