Greek Brown Rice and Vegetable Casserole

4.54 from 15 votes

2 hours 40 minutes

This Greek Vegetable Casserole recipe is vegetarian comfort food that's hearty enough to satisfy a carnivore. Zucchini, yellow squash, bell peppers, herbs and brown rice in a creamy ricotta and feta cheese blend is then topped with fresh tomatoes and baked for a delicious make-ahead meal!

Serve the vegetarian casserole with soup, salad or Mediterranean Braised Green Beans with Tomatoes for a meatless meal everyone will rave about!

Greek Brown Rice and Vegetable Casserole in white baking dish garnished with fresh parsley.

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Why This Recipe Is a Keeper:

I have made and loved this vegetable casserole recipe with brown rice for many years. It's inspired by one that first appeared in the classic Moosewood Cookbook by Mollie Katzen published in 1977 and reissued in 1992 with lighter versions of all the dishes from the original.

Her version was called “Bulgarian Pepper Casserole” and because of the name, it wasn’t a big seller with my personal chef clients. Bell peppers, especially green bell peppers, can be difficult for some people to handle. Once I changed the name to be more descriptive and swapped out the green bell pepper for zucchini, yellow squash and sweet peppers it became a hit!

Greek Vegetable Casserole can be made ahead, freezes great and meat-eaters won't miss the meat!

Greek Brown Rice and Vegetable Casserole in white baking dish with serving spoon on blue napkin.

How to make a Greek Vegetable Casserole Recipe:

Recipe Ingredients:

Here’s everything you’ll need to make this vegetable casserole recipe along with how to prep. See the recipe card below for the exact quantities.

Ingredients for Greek Brown Rice and Vegetable Casserole in glass bowls.

Ingredient Notes:

Onions: Use purchased frozen chopped onions to save time. Whenever I chop too many onions, I save and place in a quart-size zipper-top bag and place in the freezer for my own frozen ready-to-use chopped onions anytime.
Bell Peppers: You can use any color or combination of peppers including green if you like.
Zucchini and Yellow Squash: I used a combination but you can use all zucchini or all yellow squash if that's what you have.
Dill: If you can find a sufficient amount of fresh dill, by all means use it. Fresh dill in quantity is hard to find in my area so I often have to use dried dill.
Oregano: I prefer fresh because we have oregano year-round in the South but dried is just fine.
Lemon Juice: Fresh is always best!
Cooked Brown Rice: This recipe is a great way to use leftover brown rice. You'll need four cups. If you need to cook brown rice, add at least 30 minutes to the cook/prep time. You can often find cooked brown rice in the freezer section of your grocery store near the vegetables. Quinoa can be substituted for brown rice.
Kalamata Olives: Pitting Kalamata olives can be labor-intensive however, they are available pitted. When purchasing “pitted” Kalamata olives, I treat them as though they still have the pit. I never take for granted that the mechanical pitting process got all the pits—I look each one over.
Tomatoes: Use round or plum tomatoes.

Step-By-Step Instructions:

Gather and prep all the ingredients. Preheat the oven to 375 degrees and lightly oil a baking dish.
Heat the oil and add the onion. Cook until softened.

Add the bell pepper and cook until that starts to soften up then add the zucchini and yellow squash and cook until softened.
Stir in the garlic, herbs and crushed red pepper flakes.

Cooked onions, peppers, zucchini and yellow squash in skillet.

Combine the vegetables, brown rice, cheeses and egg in a bowl and stir to combine.

Ingredients for Greek Brown Rice and Vegetable Casserole in stainless steel bowl before being stirred together.

Ingredients for Greek Brown Rice and Vegetable Casserole stirred together in stainless steel bowl.

Transfer to the prepared baking dish, smooth the top then add the tomatoes and black olives.
MAKE AHEAD: Can be assembled to this point 1-2 days in advance without the tomatoes. Top with tomatoes and olives right before baking. Let sit at room temperature for 30 minutes to take the chill off. You may need to add additional baking time.

Assembled Greek Brown Rice and Vegetable Casserole before tomatoes and black olives are added.

Assembled Greek Brown Rice and Vegetable Casserole before being baked.

Bake the vegetable casserole until heated through to 165 degrees in the center and the edges are lightly crispy.
Garnish this lovely Greek Brown Rice and Vegetable Casserole with chopped fresh parsley if desired and serve!

Greek Brown Rice and Vegetable Casserole garnished with fresh parsley with serving spoon on blue napkin.

Chef Tips and Tricks:

Tip for cooking brown rice:
- My favorite way to cook brown rice is to cook it like pasta. Get a large saucepan of water boiling, add some salt then the rice and simply boil it until it's tender—I don’t even measure.
- Drain thoroughly in a sieve and the result will be the most beautiful, fluffy brown rice!
- When I cook brown rice at home, I always cook extra so that I can freeze it and have it available when needed.
- You can also do it in an Instant Pot or other pressure cooker but it takes about the same time as simply boiling it. Here are instructions for the Instant Pot from Culinary Scientist Jessica Gavin.

To refresh dried herbs, rub them between your index finger and thumb as you're adding them to your dish.
If you have to pit the Kalamata olives, place the olive on a flat surface such as a cutting board. Press down on the olive on the end closest to you with your thumb; the pit should pop right out.