I just finished a Whole Food Casserole where quinoa, veggies, and gooey cheese turn into a single-pan, feel-good dinner you’ll want on repeat.

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I’m obsessed with this Cheesy Veggie Quinoa Casserole because it actually tastes like real food, not some bland health stunt. I love the way quinoa gives a nutty backbone and those pockets of melted shredded sharp cheddar cheese make every bite sing.

Broccoli florets, chopped small, add a crunchy pop and color that stops it from being mushy. Seriously, this belongs in my rotation when I want Delicious Meatless Meals that don’t feel like a compromise.

Casseroles With Quinoa are my go-to on nights I need something filling, veggie-packed, and totally satisfying. I will make it again and love it.

Ingredients

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Quinoa: Basically tiny protein bombs that soak up all the cheesy goodness.
Vegetable broth: Adds gentle savory background without being too salty.
Olive oil: Gives a light, fruity richness and helps veggies brown.
Butter: Adds cozy richness and makes it feel indulgent.
Yellow onion: Sweet, caramelizes fast and smells like home.
Garlic: Punchy little bites of warmth and depth.
Bell pepper: Bright crunch and fresh color, keeps it lively.
Zucchini: Softens nicely and keeps things tender, not mushy.
Carrots: Natural sweetness and tiny texture pops throughout.
Broccoli: Green bite and little tree-like crunch moments.
Frozen corn: Pops of sweet corn that feel nostalgic.
Baby spinach: Sneaky greens that wilt into creamy pockets.
Sharp cheddar: Bold melty flavor that makes everyone smile.
Parmesan: Salty, nutty finish and great browned bits.
Milk: Adds creaminess so the casserole isn’t dry.
Eggs: Hold it together and add richness, like glue but tasty.
Breadcrumbs: Crunchy top texture if you want a crust.
Italian seasoning: Herb warmth that ties veggies together simply.
Smoked paprika: Little smoky kick without overpowering everything.
Salt and pepper: Basics that make all the flavors pop.
Parsley: Bright, fresh finish when you sprinkle it on.

Ingredient Quantities

1 cup quinoa, rinsed

2 cups low sodium vegetable broth

1 tablespoon olive oil

1 tablespoon butter

1 medium yellow onion, chopped

2 cloves garlic, minced

1 cup red or green bell pepper, diced

1 cup zucchini, diced

1 cup carrots, grated or finely diced

1 cup broccoli florets, chopped small

1 cup frozen corn, thawed

2 cups baby spinach, roughly chopped

1 cup shredded sharp cheddar cheese (plus extra for topping if you want)

1/2 cup grated Parmesan cheese

3/4 cup milk (whole or 2%)

2 large eggs, beaten

1/2 cup plain breadcrumbs or panko

1 teaspoon dried Italian seasoning

1/2 teaspoon smoked paprika

1 teaspoon kosher salt, adjust to taste

1/2 teaspoon freshly ground black pepper

2 tablespoons fresh parsley, chopped (optional)

How to Make this

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1. Preheat oven to 375 F and grease a 9×13 inch baking dish with the butter, then set aside.

2. In a medium saucepan bring the rinsed quinoa and 2 cups vegetable broth to a boil, reduce heat, cover and simmer 15 minutes until liquid is absorbed; remove from heat and let sit covered 5 minutes, then fluff with a fork.

3. While quinoa cooks heat olive oil in a large skillet over medium, add onion and sauté 3 to 4 minutes until soft, add garlic and cook 30 seconds more until fragrant.

4. Add bell pepper, zucchini, carrots and broccoli to the skillet, season with Italian seasoning, smoked paprika, salt and pepper, and cook about 6 to 8 minutes until veggies are tender crisp; stir in the thawed corn and chopped spinach and cook just until spinach wilts, then remove from heat.

5. In a large mixing bowl combine the fluffed quinoa, sautéed veggies, 1 cup shredded cheddar, Parmesan, beaten eggs, milk and 1/2 cup breadcrumbs; mix thoroughly so cheese and eggs bind everything together. Taste and adjust salt and pepper if needed.

6. Transfer the mixture into the prepared baking dish, press down lightly to even it out. Sprinkle extra cheddar on top if you want a cheesier crust and a light dusting of breadcrumbs for crunch.

7. Bake in the preheated oven 25 to 30 minutes until the casserole is set in the center and the top is golden brown.

8. If you like a browner top, pop it under the broiler 1 to 2 minutes watching closely so it doesn’t burn.

9. Let the casserole rest 8 to 10 minutes so it firms up, then sprinkle with fresh parsley before slicing. Serve warm.

Equipment Needed

1. 9×13 inch baking dish (greased with butter)
2. Medium saucepan (for cooking quinoa)
3. Large skillet (for sautéing vegetables)
4. Large mixing bowl
5. Measuring cups and spoons
6. Wooden spoon or heatproof spatula
7. Fork (for fluffing quinoa) or whisk (for eggs)
8. Fine-mesh strainer or colander (to rinse quinoa)
9. Oven mitts and a baking sheet or broiler-safe rack (for broiling and resting)

FAQ

Can I use brown quinoa instead of white quinoa?

Yes, but brown quinoa takes longer to cook and will make the casserole firmer. You should either pre-cook the brown quinoa for about 20 minutes before mixing, or increase the bake time by 10 to 15 minutes and check for tenderness.

Can I make this dairy free or vegan?

Absolutely. Swap the cheddar and Parmesan for vegan cheeses, replace butter with olive oil, use a plant milk like unsweetened almond or oat, and substitute the eggs with 1/2 cup plain silken tofu blended smooth or two tablespoons flaxseed meal mixed with 6 tablespoons water (let sit 5 minutes).

How do I stop the casserole from being too watery?

Make sure quinoa is well drained and any frozen veggies are thawed and patted dry. Slightly undercook very watery veggies like zucchini, or squeeze out excess moisture with a towel. Also let the casserole rest 10 to 15 minutes after baking so it firms up before slicing.

Can I add other vegetables or proteins?

Yes, add what you like. Mushrooms, peas, roasted sweet potato, cooked chicken, or cooked sausage all work. Just keep roughly the same total volume of mix-ins so the texture stays balanced.

How do I store and reheat leftovers?

Refrigerate in an airtight container for up to 4 days, or freeze portions up to 2 months. Reheat in the oven at 350 F for 10 to 15 minutes or microwave until warmed through. If frozen, thaw overnight in fridge before reheating for best texture.

Can I make this ahead of time for a potluck?

Yes. You can assemble the casserole the night before, cover and refrigerate, then bring to room temperature while the oven preheats and bake as directed. Or fully bake, cool, and reheat at the host's place; sprinkle extra cheese on top for a fresh look.

Cheesy Veggie Quinoa Casserole Recipe Substitutions and Variations

Quinoa: swap with 1 cup cooked farro or pearl couscous for a chewier texture, or use 1 cup long grain rice if you want something more familiar, just adjust cooking time cause rice takes longer.
Low sodium vegetable broth: use low sodium chicken broth if you’re not vegetarian, or dissolve 1 vegetable bouillon cube in 2 cups hot water, or just use water plus a pinch extra salt for a milder flavor.
Shredded sharp cheddar: you can use Monterey Jack or Colby for a milder melt, or pepper jack if you want a little kick, or mix in 1 cup shredded mozzarella for ultra gooeyness.
Plain breadcrumbs or panko: crushed saltine or Ritz crackers work great, or use 1/2 cup quick oats for a gluten free-ish binder, or try crushed cornflakes for extra crunch on top.

Pro Tips

1) Rinse quinoa well and toast it quick in the saucepan with a teaspoon of oil before adding broth, it gives a nuttier flavor and keeps it from getting mushy if you overcook it a little.
2) Don’t overcook the veggies, you want a bit of bite so the casserole has texture, cook them just till tender crisp then cool a minute before mixing with eggs so they dont steam the eggs and make the whole thing soggy.
3) If you want it creamier fold in a couple tablespoons of cream cheese or sour cream with the milk, but skip extra salt since those add salt, taste before you add more.
4) Press the mixture firmly into the dish and let it rest longer than you think, 10 to 15 minutes makes it slice way cleaner, if you cut it too hot it will fall apart.
5) For a crunchier top mix panko with a little melted butter and sprinkle on near the end of baking, broil for no more than 60 to 90 seconds and watch it cause it goes from perfect to burnt real fast.

Cheesy Veggie Quinoa Casserole Recipe

Recipe by Pho Tsventichi

0.0 from 0 votes

I just finished a Whole Food Casserole where quinoa, veggies, and gooey cheese turn into a single-pan, feel-good dinner you’ll want on repeat.

Servings

servings

Calories

354

kcal

Equipment: 1. 9×13 inch baking dish (greased with butter)
2. Medium saucepan (for cooking quinoa)
3. Large skillet (for sautéing vegetables)
4. Large mixing bowl
5. Measuring cups and spoons
6. Wooden spoon or heatproof spatula
7. Fork (for fluffing quinoa) or whisk (for eggs)
8. Fine-mesh strainer or colander (to rinse quinoa)
9. Oven mitts and a baking sheet or broiler-safe rack (for broiling and resting)

Ingredients

1 cup quinoa, rinsed
2 cups low sodium vegetable broth
1 tablespoon olive oil
1 tablespoon butter
1 medium yellow onion, chopped
2 cloves garlic, minced
1 cup red or green bell pepper, diced
1 cup zucchini, diced
1 cup carrots, grated or finely diced
1 cup broccoli florets, chopped small
1 cup frozen corn, thawed
2 cups baby spinach, roughly chopped
1 cup shredded sharp cheddar cheese (plus extra for topping if you want)
1/2 cup grated Parmesan cheese
3/4 cup milk (whole or 2%)
2 large eggs, beaten
1/2 cup plain breadcrumbs or panko
1 teaspoon dried Italian seasoning
1/2 teaspoon smoked paprika
1 teaspoon kosher salt, adjust to taste
1/2 teaspoon freshly ground black pepper
2 tablespoons fresh parsley, chopped (optional)

Directions

Preheat oven to 375 F and grease a 9×13 inch baking dish with the butter, then set aside.
In a medium saucepan bring the rinsed quinoa and 2 cups vegetable broth to a boil, reduce heat, cover and simmer 15 minutes until liquid is absorbed; remove from heat and let sit covered 5 minutes, then fluff with a fork.
While quinoa cooks heat olive oil in a large skillet over medium, add onion and sauté 3 to 4 minutes until soft, add garlic and cook 30 seconds more until fragrant.
Add bell pepper, zucchini, carrots and broccoli to the skillet, season with Italian seasoning, smoked paprika, salt and pepper, and cook about 6 to 8 minutes until veggies are tender crisp; stir in the thawed corn and chopped spinach and cook just until spinach wilts, then remove from heat.
In a large mixing bowl combine the fluffed quinoa, sautéed veggies, 1 cup shredded cheddar, Parmesan, beaten eggs, milk and 1/2 cup breadcrumbs; mix thoroughly so cheese and eggs bind everything together. Taste and adjust salt and pepper if needed.
Transfer the mixture into the prepared baking dish, press down lightly to even it out. Sprinkle extra cheddar on top if you want a cheesier crust and a light dusting of breadcrumbs for crunch.
Bake in the preheated oven 25 to 30 minutes until the casserole is set in the center and the top is golden brown.
If you like a browner top, pop it under the broiler 1 to 2 minutes watching closely so it doesn't burn.
Let the casserole rest 8 to 10 minutes so it firms up, then sprinkle with fresh parsley before slicing. Serve warm.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.