Oven Roasted Ratatouille

$5.68 recipe / $0.71 serving
by Beth - Budget Bytes
4.78 from 54 votes
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What happens when you take thinly sliced vegetables, layer them in a dish, add a rich red sauce, plenty of herbs, and a cheesy topping? You get this insanely delicious Oven Roasted Ratatouille, aka “the vegetable dish that vegetable haters won’t be able to get enough of.” While this interpretation of ratatouille isn’t exactly traditional, I think you’re going to love it. It kind of reminds me of pizza, but like, made out of really pretty vegetables (and it certainly made my house smell like pizza).

Originally posted 5-19-2014, updated 7-8-2021.

Overhead view of oven roasted ratatouille in the casserole dish with a serving spoon

What is Ratatouille?

Ratatouille is a classic French dish made of stewed vegetables, like tomato, zucchini, eggplant, onion, and bell pepper. It’s rich, comforting, and perfect for sopping up with a piece of crusty artisan bread or ladling over a bowl of polenta. As with most recipes that have been around for generations, there are many interpretations of ratatouille, and I definitely took mine in a different direction.

Rather than stewing the vegetables together in a pot, I chose to make an oven roasted ratatouille, which is a common alternative to the stewed version. Not only is oven roasting the sliced vegetables super pretty, but it’s a little more hands-off than stewing vegetables in a pot, which I appreciate. I also added marinara sauce to the bottom of my casserole dish which ends up mixing with the juices from the vegetables and creating the most delicious sauce (get some bread ready for dipping). Lastly, I topped with cheese, which definitely isn’t the norm for ratatouille, but it sure was delicious! And it really created that pizza-like effect. 

What Size Vegetables to Use

This recipe is extremely flexible. I’ve given some approximate weight values for the vegetables below, but you can really use whatever size you have available and whatever you can squeeze into your baking dish. But a word of advice–once sliced the volume of the vegetables always ends up being more than you estimated, so err on the side of smaller vegetables.

And you don’t have to make the vegetables line up or alternate perfectly in the dish. Just squeeze the slices in there and you’ll be good! I promise it will still taste great even if it doesn’t look perfect. ;) 

What Kind of Baking Dish to Use 

The size of the dish you’ll need will probably vary a bit with the size of your vegetables, but I would suggest using something in the neighborhood of a 9″x11″ rectangular casserole dish, or a 3 quart round dish. You can use a dish made with glass, ceramic, or metal. 

How to Serve Oven Roasted Ratatouille

Oven roasted ratatouille makes a delicious side dish for grilled or roasted meat, like Herb Roasted Pork Tenderloin, Garlic Butter Baked Cod, or Herb Roasted Chicken Breast. You could also serve this as part of a vegetarian meal by pairing it with something like a rich and creamy risotto or serving it on top of a bowl of polenta.

side view of ratatouille in the casserole dish

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Oven Roasted Ratatouille

4.78 from 54 votes
Oven roasted ratatouille combines all of summer's delicious vegetables into one rich, flavorful, and beautiful side dish.
oven roasted ratatouille with a portion scooped out of the corner
Servings 8 ¾ cup each
Prep 20 minutes
Cook 45 minutes
Total 1 hour 5 minutes


  • 1 cup marinara sauce ($0.50)
  • 1 yellow onion ($0.25)
  • 1 eggplant (about 1 lb.) ($1.49)
  • 1 zucchini (about ½ lb.) ($0.71)
  • 1 yellow squash (about ½ lb.) ($0.55)
  • 3 Roma tomatoes ($0.87)
  • 1 Tbsp olive oil ($0.16)
  • 1/2 tsp dried basil ($0.05)
  • 1/2 tsp dried oregano ($0.05)
  • 1/8 tsp Freshly cracked black pepper ($0.01)
  • 1/8 tsp salt ($0.01)
  • 1 cup shredded mozzarella ($0.94)
  • 1 Tbsp chopped parsley (optional) ($0.09)


  • Preheat the oven to 400ºF. Thinly slice the yellow onion. Slice the eggplant, zucchini, yellow squash, and tomatoes into ⅛-inch thick slices. Cut any pieces with a larger diameter into half-rounds.
  • Pour the marinara in the bottom of a large casserole dish. Sprinkle the sliced onions over top.
  • Begin to line up the sliced eggplant, zucchini, squash, and tomatoes into the dish, standing on their sides, and in an alternating pattern until all of the pieces are used up. Drizzle the olive oil over the vegetables, then sprinkle the basil, oregano, salt, and pepper over top.
  • Transfer the dish to the oven and roast the vegetables for 40 minutes. After 40 minutes, remove the dish from the oven and sprinkle the shredded mozzarella over top. Return the casserole dish to the oven for five minutes, or until the cheese is melted and creamy.
  • After roasting, sprinkle the chopped parsley over top, then serve.

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Try to purchase vegetables that are a close size in diameter to make layering easier.


Serving: 1ServingCalories: 99kcalCarbohydrates: 9gProtein: 5gFat: 5gSodium: 291mgFiber: 3g
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How to Make Oven Roasted Ratatouille – Step by Step Photos

Eggplant, onion, squash, and tomatoes whole on a cutting board

For this recipe, I used one small eggplant (about 1 lb.), one yellow onion, one yellow squash (1/2 lb.), one zucchini (½ lb.), and three Roma tomatoes. The eggplant, squash, zucchini, and tomatoes are the vegetables that will get layered pretty in the dish, while the onion will be hiding underneath in a base layer.

Sliced eggplant, squash, zucchini, and tomatoes

Preheat the oven to 400ºF. Thinly slice the eggplant, squash, zucchini, and tomatoes. You want everything to be similar in height when placed in the casserole dish, so for pieces with a larger diameter, you’ll want to slice those in half (I did this for the eggplant and larger ends of the squash and zucchini). Aim for ⅛-inch thick slices. 

onion and marinara in the casserole dish

Thinly slice the onion. Spread 1 cup marinara in the bottom of a large casserole dish. Sprinkle the sliced onion over top.

Layered vegetables in the casserole dish

Layer the vegetables in the dish standing up on their sides, like cards in a card catalog (wait, did I just date myself??). They do NOT need to be perfect. Just start squeezing them in as best you can. It’s nice to try to alternate them in a pattern, but once you get toward the end you might have more left of one type of vegetable, so just start popping them in there anywhere they’ll fit. Drizzle 1 Tbsp olive oil over top. Sprinkle ½ tsp dried basil, ½ tsp dried oregano, ⅛ tsp freshly cracked pepper, and ¼ tsp salt on top of the vegetables.

Roasted ratatouille in the casserole dish

Transfer the dish to the preheated 400ºF oven and roast for 40 minutes.

Cheese being sprinkled on top of the ratatouille

After 40 minutes, remove the dish from the oven and sprinkle 1 cup of shredded mozzarella on top. Return the dish to the oven and bake for an additional 5 minutes, or until the cheese is melted and creamy.

Melted cheese on oven roasted ratatouille

Top with a little chopped parsley, then serve!

oven roasted ratatouille with a portion scooped out of the corner

So delicious… and it’s just begging for a beautiful baguette to bathe in it. Mmmmm. You’ve got to spoon some of that sauce from the bottom of the pan onto your plate!

Close up side view of ratatouille in the casserole dish

Closer look? So pretty. I ❤️ vegetables!

Try These Other Easy Veggie Side Dishes

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  1. I really enjoyed this recipe! So fresh & easy to put together (thanks to the mandolin my mom gave me.) I baked it for 40 min plus 5 after adding cheese & it came out perfectly! My boyfriend & I enjoyed it for dinner & paired with just some simple toasty buttered bread. I did a modify a couple things though.

    – I cut the veggies to 1/4”
    – I used 2 beef steak tomatoes because the Roma tomatoes looked sad that day
    – I used 1/2 tsp salt & 1/4 tsp ground black pepper (plus more to taste after baking was finished)
    – I topped it off with fresh basil, thyme, & parmesan cheese instead of parsley

    10/10 will make again!

  2. I really like this dish, because I was able to eat something both delicious, hearty and vegetarian. I recommend wetting the eggplants though, not drying them because crispy food hurts my teeth… and if u don’t like your sauce too watery just blend like a teaspoon of some flour into the sauce. that is all my personal choices though. This dish is truly an inspiration to me though.

  3. This recipe sounded delicious and I was super excited to try it, but it was a complete disappointment. The onions tasted raw and the eggplant was rubbery and underdone. The first unsuccessful recipe I’ve had from Budget Bytes.

    1. I tried this recipe too, but from my experience with eggplant I have to wet it, not dry it before slathering oil all over it.. i covered it as well til the end to make the top crispy and i think the next time i will have to add a teaspoon of flour to thicken the sauce a bit and catch any water that falls from the veggies.

  4. This is a GREAT recipe for the summer veggies! I first used it about 10 years ago when my daughter belonged to a basket program, & we got lots! of zucchini & needed to find a way to use it….we found this recipe & it has been a family favorite!

  5. I made this with marinara sauce, two different types of squash (zucchini and patty pan), sliced onion and sliced tomato and topped it with cheddar cheese and parmesan cheese. It was delicious. I will enjoy making it again as summer progresses and the mix of garden produce changes.

  6. Easy to make, beautiful to look at, really inexpensive, very healthy and MUCH better than my stovetop ratatouille. My husband and I devoured it. Yum with a capital Y.

  7. My family LOVED this recipe! It was quick to pull together, inexpensive, and beautiful. I served it alongside crusty “pan de agua” for a complete vegetarian meal. This one is going on my meal rotation. Well done! 👏🏽

  8. Delicious! Much tastier than the stovetop ratatouille I’ve been making for years, and it’s got a nice crunch to it, too. Thanks!

  9. Sooo good! I added some bell peppers in and mixed a little basil pesto in with the malted sauce! Divine!

  10. This one wasn’t my favorite. I found that after 45 minutes in the oven, the veggies were undercooked, and I wished that I had added far more salt than the 1/8 tsp called for in the recipe. I think this was the first recipe I’ve tried here that I didn’t love, though, so I’m sure I’ll find something else to enjoy. Thanks!

  11. Gals, this was so good. I followed the recipe to a t. Call it: layering while singing. It’s a bit watery, sure, but I didn’t mind that because I took your suggestion and made a risotto to go under it (you know that Merlot bellavitano cheese from Kroger? I used that in the risotto instead of parmigiana. Yeah, do dat.) Topped with fresh basil.  We listened to the Ratatouille soundtrack with supper and had a dessert of cheese and berries. Merci! Tres bon!! Or even Molto bene! Good supper bro, for real.