This vegan Pizza Quinoa Casserole recipe is the perfect combination of pizza and quinoa. It's all the delicious flavors of a veggie supreme pizza, but delivered in healthier quinoa form! (Vegan, gluten-free, oil-free option.)

Close up view of vegan pizza quinoa casserole in a glass baking dish with serving spoon

This tasty vegan casserole is all the delicious flavors of pizza, but delivered in healthier quinoa form!

It's brimming with fresh, nourishing ingredients to create a true veggie supreme. I enjoy garlic, onion, mushroom, tomato, spinach, and green pepper but you can absolutely change up the vegetables as you wish.

One of the best parts is you're treated to the wonderful aroma of pizza as it bakes in the oven. And the leftovers are great too, so you can reheat it throughout the week!

Fresh ingredients laid out on a metal tray

Ingredients for Pizza Quinoa Casserole

For this recipe, you'll combine in a large bowl then bake in the oven:

White quinoa: We'll use one cup white quinoa for this recipe and cook it on the stove before baking.
Yellow onion: Or you can use sweet onion or white onion if desired.
Green bell pepper: Or another color such as red bell pepper. (This adds a lot of flavor, so try not to leave it out!)
Mushrooms: I use cremini mushrooms, but white button, shiitake, Portobello, or others work great too.
Fresh garlic cloves
Roma tomato
Fresh baby spinach
Tomato sauce: We'll use a 15 ounce can tomato sauce.
Vegan mozzarella shreds: I enjoy Miyoko's, Follow Your Heart, or Violife brands, but use your own favorite dairy-free cheese. (Or see below for an oil-free option.)
Italian seasoning: Be sure your pantry spices are fresh (not expired) for best flavor.
Fresh basil: This is a delicious finishing touch! Sprinkle a couple tablespoons on top before serving for beautiful garnish and bright flavor.

Ingredients for casserole in a glass bowl before mixing together

Customizing

Make it "meaty": For extra heartiness and protein, add your favorite vegan pepperoni or sausage crumbles to the mixture. For sausage or beef crumbles, cook these separately according to package instructions. Then stir it into the mixture before adding to the baking dish.

Oil-free option: Omit the vegan cheese shreds as store-bought versions contain oil. You can leave it out entirely or replace with about a quarter cup nutritional yeast flakes. This adds some cheesy flavor. If omitting the cheese, you'll want to salt the casserole mixture to taste to bring out the flavors.

Spices & seasonings: Instead of Italian seasoning, change it up with your own favorites. Try dried basil, oregano, fennel, marjoram, parsley, etc.

Vegan casserole mixture in a glass bowl with stirring spatula

Serving

Toppings: You can also add sliced black olives, Vegan Parmesan Cheese, or red pepper flakes to taste for a little spice.

Pairing: This casserole is great served with a simple salad and a side of garlic bread or breadsticks.

Storing

Store leftovers in an airtight container in the fridge. I find it keeps for about 4-5 days. So it's a great choice for meal prep throughout the week. Simply reheat in the microwave when ready to enjoy.

Overhead view of vegan pizza quinoa casserole in a large glass baking dish

For more inspiration, also browse all easy vegan dinner recipes.

Pizza Quinoa Casserole (Vegan!)

This casserole is all the delicious flavors of a veggie supreme pizza, but delivered in healthier quinoa form! Easy to prepare, and customizable with your favorite veggies.

5 from 3 votes

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Prep Time: 30

Cook Time: 25

Total Time: 55

Author: Kaitlin - The Garden Grazer

Course: Main Dish

Cuisine: Gluten-Free, Oil-Free Option, Vegan

Servings: 6

Ingredients

1 cup white quinoa (uncooked)
1 yellow onion
1 green bell pepper
8 oz. mushrooms
4 cloves garlic
1 cup fresh baby spinach
3 roma tomatoes
15 oz. can tomato sauce
3/4 cup vegan mozzarella shreds*
2 tsp. Italian seasoning
2 Tbsp. fresh basil (for serving)

Instructions

Preheat oven to 375°F (190°C).
Cook quinoa: In a saucepan, add rinsed quinoa and 1.5 cups water. Bring to a light boil, then cover, reduce heat, and simmer for 15-20 minutes or until liquid is absorbed.
Meanwhile, dice onion, bell pepper, and mushrooms.
In a skillet over medium-high heat, sauté onion, green pepper, and mushrooms for about 7-8 minutes. (I use 3 Tbsp. water/broth for no-oil sauté method.)
Meanwhile, mince garlic and chop spinach.
Add garlic, spinach, and Italian seasoning to the skillet. Stir and sauté 1-2 minutes. Turn off heat.
When quinoa is cooked, place it in a large mixing bowl. Add sautéed vegetables, tomato sauce, cheese shreds, and roma tomatoes (diced). Stir well to combine.
Spread mixture into a 9x13 inch baking dish and gently press down. Top with a light sprinkle of cheese if desired.
Bake for 25 minutes. Garnish with fresh chopped basil before serving.

Notes

*Oil-free option: Omit vegan cheese shreds. Substitute with up to 1/4 cup nutritional yeast for cheesy flavor if desired. You'll also want to add salt to taste to enhance the flavors.

Originally published March 2013. Updated April 2023.

Nutrition Per Serving (Estimate)

Nutrition Facts

Pizza Quinoa Casserole (Vegan!)

Amount per Serving

Calories

197

% Daily Value*

Fat

Saturated Fat

Polyunsaturated Fat

Monounsaturated Fat

Potassium

671

Carbohydrates

Fiber

Sugar

Protein

Vitamin A

1158

Vitamin C

Calcium

Iron

* Percent Daily Values are based on a 2000 calorie diet.

Sodium content: This is omitted as I cannot provide an accurate number. I encourage you to calculate your own to provide a much more precise reading based on the exact ingredients, brands, and amounts you're using.

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Pizza Quinoa Casserole (Vegan!)

Ingredients for Pizza Quinoa Casserole

Customizing

Serving

Storing