Roasted Vegetable Quinoa Casserole

Highlighted under: Fresh Ideas

I absolutely love making Roasted Vegetable Quinoa Casserole, especially when I have an array of fresh vegetables at hand. The earthy flavors of the roasted veggies paired with the nutty quinoa create a dish that's not only wholesome but also incredibly satisfying. I find that baking it allows all the flavors to meld together beautifully, making every bite a delightful combination of textures and tastes. Plus, it’s a one-dish meal, which means less cleanup afterward, perfect for a busy weeknight dinner!

Lorna Whitcombe

Created by

Lorna Whitcombe

Last updated on 2026-01-21T21:45:34.890Z

When I first tried making a quinoa casserole, I never expected it to be so delicious. The blend of roasted vegetables adds a depth of flavor that truly elevates the dish. I've experimented with various vegetables, but I always find that a mix of zucchini, bell peppers, and carrots works perfectly.

The secret to a great casserole is to roast the vegetables beforehand; this caramelizes their natural sugars and intensifies their flavors. I usually toss them with a bit of olive oil and seasoning, which makes a world of difference when mixed with the quinoa.

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Why You'll Love This Recipe

  • Nutrient-packed dish that’s both filling and healthy
  • Versatile recipe that can be adapted with seasonal vegetables
  • Perfect for meal prep and leftovers taste even better!

Choosing the Right Vegetables

Selecting fresh, in-season vegetables is key to enhancing the flavor of your Roasted Vegetable Quinoa Casserole. I love to mix a variety of colors and textures; for instance, substituting an eggplant or adding cherry tomatoes can introduce a sweetness that balances the earthy elements. You can also incorporate leafy greens like spinach or kale during the last few minutes of roasting for extra nutrients without overpowering the dish.

When prepping your vegetables, cut them into uniform sizes. This ensures even cooking and caramelization. If you're using denser vegetables like carrots or sweet potatoes, consider chopping them smaller or roasting them longer than the softer vegetables for a consistent texture throughout the casserole.

Perfecting the Quinoa

Rinsing quinoa is crucial as it removes its natural coating called saponin, which can impart a bitter flavor. I recommend using a fine-mesh sieve to thoroughly rinse the quinoa under cold running water for about 2-3 minutes. Additionally, to enhance its nutty flavor, you can toast the quinoa in a dry pan for a few minutes before cooking it in broth—a technique I often use.

When cooking quinoa, maintaining the correct liquid-to-quinoa ratio is essential. If you find your quinoa too mushy, decrease the broth slightly next time, or try the absorption method: bring it to a boil, then lower the heat and leave it covered without peeking. It's ready when you see little spirals forming in the cooked grains.

Storage and Serving Suggestions

This casserole is fantastic for meal prep! You can store leftovers in an airtight container in the fridge for up to 4-5 days. When reheating, add a splash of vegetable broth or a drizzle of olive oil to restore moisture and warmth. For a quick lunch, serve the casserole cold over a bed of greens for a refreshing salad option.

For a creative twist, try topping the casserole with a dollop of Greek yogurt or a sprinkle of fresh herbs before serving. If you want to cater to different tastes, consider offering extra toppings like avocado slices or chili flakes for a customizable experience. It’s versatile enough to fit various dietary preferences!

Ingredients

Gather the following ingredients to create a delicious Roasted Vegetable Quinoa Casserole:

Ingredients

  • 1 cup quinoa, rinsed
  • 2 cups vegetable broth
  • 1 zucchini, diced
  • 1 red bell pepper, chopped
  • 1 yellow bell pepper, chopped
  • 1 carrot, chopped
  • 1 onion, diced
  • 2 cloves garlic, minced
  • 1 teaspoon dried thyme
  • 1 teaspoon dried oregano
  • Salt and pepper to taste
  • 1 cup shredded cheese (optional)
  • 2 tablespoons olive oil

Make sure to prepare your ingredients before starting the cooking process for a smooth experience!

Instructions

Follow these steps to make your Roasted Vegetable Quinoa Casserole:

Roast the Vegetables

Preheat your oven to 400°F (200°C). On a baking sheet, toss the chopped zucchini, bell peppers, carrot, onion, and garlic with olive oil, thyme, oregano, salt, and pepper. Roast for about 25 minutes, or until the vegetables are tender and slightly caramelized.

Cook the Quinoa

While the vegetables are roasting, combine the rinsed quinoa and vegetable broth in a medium saucepan. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes or until the quinoa is fluffy and the broth is absorbed.

Combine and Bake

In a large mixing bowl, combine the cooked quinoa and roasted vegetables. Mix well, then transfer to a greased baking dish. If desired, sprinkle shredded cheese on top. Bake in the oven for an additional 15 minutes, until heated through and cheese is melted.

Enjoy your casserole warm and savor the amazing blend of flavors!

Pro Tips

  • For added protein, consider mixing in some cooked chickpeas or black beans. Also, feel free to experiment with your favorite herbs and spices for a customized flavor.

Ingredient Substitutions

If you're in a pinch and don't have vegetable broth, water works well as a substitute, though it may slightly alter the flavor profile. For a richer taste, try using low-sodium chicken broth or mushroom broth, which adds depth to the dish. Dairy-free cheese can easily replace regular cheese for a vegan option, and they melt similarly when baked.

Consider swapping quinoa with brown rice or farro for a different texture. However, remember cooking times will vary; brown rice typically requires around 40-45 minutes to cook, so plan accordingly to coordinate with your vegetable roasting time.

Troubleshooting Common Issues

If your casserole comes out dry, it might be due to overcooking the quinoa or not using enough broth. Next time, keep an eye on the cooking process and include extra liquid if needed. On the flip side, if it becomes too watery, it could be that the vegetables released more moisture than anticipated. Adding a bit of breadcrumbs on top before baking can help absorb excess liquid.

For those who find their vegetables undercooked, ensure they are cut small enough and spread out evenly on the baking sheet. Crowding can lead to steaming rather than roasting. If this happens, I recommend giving them an extra 5-10 minutes in the oven to achieve that desired caramelization.

Questions About Recipes

→ Can I use frozen vegetables in this recipe?

Yes, frozen vegetables can be used, but make sure to thaw and drain excess water to avoid a soggy casserole.

→ How long will leftovers last?

Leftovers can be stored in the refrigerator for up to 3 days. Reheat in the oven or microwave before serving.

→ Can I make this recipe vegan?

Absolutely! Simply omit the cheese or use a vegan cheese alternative.

→ What other vegetables work well in this casserole?

Feel free to use vegetables like broccoli, asparagus, or spinach for different flavors and textures. Just adjust the roasting time accordingly.

Roasted Vegetable Quinoa Casserole

I absolutely love making Roasted Vegetable Quinoa Casserole, especially when I have an array of fresh vegetables at hand. The earthy flavors of the roasted veggies paired with the nutty quinoa create a dish that's not only wholesome but also incredibly satisfying. I find that baking it allows all the flavors to meld together beautifully, making every bite a delightful combination of textures and tastes. Plus, it’s a one-dish meal, which means less cleanup afterward, perfect for a busy weeknight dinner!

Prep Time20 minutes
Cooking Duration40 minutes
Overall Time60 minutes

Created by: Lorna Whitcombe

Recipe Type: Fresh Ideas

Skill Level: Intermediate

Final Quantity: 6 servings

What You'll Need

Ingredients

  1. 1 cup quinoa, rinsed
  2. 2 cups vegetable broth
  3. 1 zucchini, diced
  4. 1 red bell pepper, chopped
  5. 1 yellow bell pepper, chopped
  6. 1 carrot, chopped
  7. 1 onion, diced
  8. 2 cloves garlic, minced
  9. 1 teaspoon dried thyme
  10. 1 teaspoon dried oregano
  11. Salt and pepper to taste
  12. 1 cup shredded cheese (optional)
  13. 2 tablespoons olive oil

How-To Steps

Step 01

Preheat your oven to 400°F (200°C). On a baking sheet, toss the chopped zucchini, bell peppers, carrot, onion, and garlic with olive oil, thyme, oregano, salt, and pepper. Roast for about 25 minutes, or until the vegetables are tender and slightly caramelized.

Step 02

While the vegetables are roasting, combine the rinsed quinoa and vegetable broth in a medium saucepan. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes or until the quinoa is fluffy and the broth is absorbed.

Step 03

In a large mixing bowl, combine the cooked quinoa and roasted vegetables. Mix well, then transfer to a greased baking dish. If desired, sprinkle shredded cheese on top. Bake in the oven for an additional 15 minutes, until heated through and cheese is melted.

Extra Tips

  1. For added protein, consider mixing in some cooked chickpeas or black beans. Also, feel free to experiment with your favorite herbs and spices for a customized flavor.

Nutritional Breakdown (Per Serving)

  • Calories: 350 kcal
  • Total Fat: 12g
  • Saturated Fat: 3g
  • Cholesterol: 15mg
  • Sodium: 250mg
  • Total Carbohydrates: 54g
  • Dietary Fiber: 8g
  • Sugars: 4g
  • Protein: 10g