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    Home » Recipes » Mains

    Vegetarian Taco Casserole with Quinoa

    Published: Dec 8, 2021 // Last modified: Feb 9, 2022 by Lizzie Streit, MS, RDN // 2 Comments

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    images of vegetarian taco casserole with quinoa separated by text box with recipe name
    vegetarian quinoa Mexican casserole in a baking dish surrounded by toppings
    vegetarian taco casserole with quinoa with a text box with recipe name

    This easy and healthy vegetarian taco casserole with quinoa comes together with 15 minutes of prep time and 25 minutes in the oven! It relies on pantry staples to deliver bold Mexican flavors. Plus, you can serve the whole family with this recipe! Prep ahead and freezing instructions included.

    serving of vegetarian taco casserole on a plate next to toppings and napkin

    This post may contain affiliate links. For more information, see my affiliate disclosure.

    December is here, and it’s officially the most wonderful time of the year! But for many people, myself included, it’s also the busiest time of the year.

    Our schedule is delightfully full at the moment. While I’m glad to have many fun events to look forward to this holiday season, it’s been difficult to keep up with food prep and cooking. I’m sure many of you are feeling the same way!

    That’s why I’m sharing a super easy meal that’s perfect for busy weeknights in December (or any time of year). This vegetarian taco casserole is veggie-loaded, nutritionally balanced, and made with mostly pantry ingredients.

    As if it wasn’t already easy enough, you can also prep my healthy Mexican casserole ahead of time, refrigerate or freeze, and pop it in the oven when you’re ready to eat. I’m smitten! And I hope you will be too.

    shredded cheese, diced tomatoes, chiles, black beans, corn, onion, spices, pepper, and quinoa on a counter

    How to Make Vegetarian Taco Casserole

    For the full ingredients list and instructions, scroll down to the recipe card at the bottom of the post. In the meantime, here’s a preview of this easy recipe followed by my expert tips.

    1. Prepare ingredients. If you have not already made it, prep quinoa according to package instructions. Chop bell pepper and onion. Gather the other ingredients. diced bell pepper and yellow onion on a bamboo cutting board with chef's knife
    2. Cook pepper and onion. Sautee the veggies in a skillet with olive oil and spices. diced bell pepper and yellow onion with Mexican spices cooking in a skillet
    3. Combine everything in a bowl. Mix together the quinoa, veggies, beans, corn, diced tomatoes (with their juices), and green chiles. Season with salt and pepper. filling for vegetarian taco casserole with quinoa in a large mixing bowl with a spoon
    4. Spread out the filling in a casserole dish and top with cheese. Bake until cheese is bubbly, add toppings of choice, and enjoy! vegetarian taco casserole with quinoa in a serving dish before going into the oven

    Expert Tips

    • To save time, prepare the quinoa in advance and keep it in the fridge until you’re ready to add it to the filling. Some grocery stores also sell frozen, microwaveable packets of quinoa. If you can’t make quinoa head of time, don’t worry. It doesn’t take long to cook (about 15 minutes) and can be made while you prep the other ingredients.
    • Topping ideas include avocado, chopped cilantro, sour cream or Greek yogurt, salsa, tortilla strips, chopped tomatoes, and/or lime juice. It’s really delicious with any and all of these toppings!
    • Possible substitutions include brown rice for quinoa, pinto beans for black beans, or a jar of salsa for diced tomatoes. You can also add cooked ground beef or turkey to the filling.
    • Leftovers will last for 3 to 5 days in an airtight container in the fridge. Store leftovers separately from toppings. Reheat vegetarian taco casserole for 1 to 2 minutes in the microwave until warmed through. You can also reheat it in the oven in a baking dish for 15 minutes at 300 degrees F.
    vegetarian quinoa Mexican casserole in a baking dish surrounded by toppings and serving spoon

    Prep Ahead and Freezing Instructions

    You can make vegetarian taco casserole with quinoa a few hours ahead of time. Prep the filling, spread it in a baking dish, and add the shredded cheese. Cover and refrigerate. When you’re ready to bake it, uncover and increase the baking time to 30 to 35 minutes at 350 degrees F. Add toppings before serving.

    To freeze this casserole, prepare it in a freezer-friendly casserole dish with lid (without the toppings). Freeze it for up to 3 months. When you’re ready to eat it, thaw in the fridge overnight then bake for 30 to 35 minutes at 350 degrees F. Alternatively, you can cook it from frozen and increase the baking time to 35 to 40 minutes.

    vegetarian taco casserole with quinoa on a plate topped with avocado and cilantro

    Similar Recipes

    If you love this vegetarian taco casserole with quinoa, check out the Lentil Tortilla Soup, Spaghetti Squash Burrito Bowls, and Healthy Chicken Fajita Bowls. For another easy casserole recipe, see the Healthy Tater Tot Casserole with Veggies. You may also enjoy the Vegetarian White Bean Chili.

    I’d love to hear how you like this recipe! Rate/review using the stars on the recipe card or in the comments, and follow the Veg World on YouTube, Instagram, Facebook, and Pinterest. Looking for something totally different? Browse the recipe library.

    serving of vegetarian taco casserole on a plate next to toppings and napkin

    Vegetarian Taco Casserole with Quinoa

    This healthy Mexican casserole is an easy recipe that can feed the whole family. It relies on pantry staples and can be made ahead of time into a freezer meal if needed.
    5 from 3 votes
    Print Pin Rate Save Saved!
    Prep Time: 15 mins
    Cook Time: 25 mins
    Total Time: 40 mins
    Servings: 6
    Calories: 377kcal
    Author: Lizzie Streit, MS, RDN

    Ingredients

    • 1 cup uncooked quinoa - yields 2.5 cups cooked
    • 1 tablespoon extra virgin olive oil
    • 1 bell pepper - diced
    • 1 yellow onion - diced
    • 1 teaspoon chili powder
    • ½ teaspoon ground cumin
    • ½ teaspoon dried oregano
    • 1 15-ounce can black beans - drained and rinsed
    • 1 15-ounce can corn - drained and rinsed
    • 1 14.5-ounce can diced tomatoes - with their juices
    • 1 4-ounce can diced mild green chiles
    • Salt - to taste
    • Black pepper - to taste
    • 1.5 cups shredded Mexican cheese - more for serving
    • Toppings - avocado, tomatoes or salsa, sour cream, cilantro, lime, tortilla strips
    Prevent your screen from going dark

    Instructions

    • Preheat the oven to 350 degrees F. Grease a 9×13 (3-quart) baking dish and set aside.
    • Prepare the quinoa according to package instructions if you haven't made it in advance. It usually takes about 15 minutes to cook, so get it going while you prep the rest of the ingredients.
    • Warm the olive oil in a medium skillet over medium heat. Add the diced pepper and onion, and cook for 5 to 7 minutes until softened. Stir in the chili powder, cumin, and oregano, and cook for a few more minutes. Remove from heat.
    • Transfer the peppers and onions to a large mixing bowl. Add the cooked quinoa, black beans, corn, diced tomatoes, and green chiles. Stir well. Season with salt and pepper to taste.
    • Spread the quinoa mixture into the prepared baking dish. Sprinkle the shredded cheese on top.
    • Bake the casserole for 20 to 25 minutes until bubbly. Add toppings of choice before serving. Enjoy!
    • Leave a rating or review by tapping the stars on this recipe card (above) or in the comments section (at the end of the post)!

    Notes

    • Serving ideas: serve with a side salad or steamed vegetable
    • Possible substitutions: brown rice for quinoa, pinto beans for black beans, jar of salsa for diced tomatoes
    • Possible additions: cooked ground beef or turkey
    • Make ahead: Prep the casserole (without the toppings) in the baking dish. Cover tightly with foil and keep in the fridge for a few hours. When you’re ready to bake it, uncover and increase the cooking time to 30 to 35 minutes.
    • Freezing: Prep the casserole (without the toppings) in a freezer-friendly casserole dish with lid. Freeze for up to 3 months. Thaw in the fridge overnight before baking (bake time: 30 to 35 minutes) or bake from frozen (bake time: 35 to 40 minutes).
    • Leftovers and reheating: Store in an airtight container in the fridge for 3 to 5 days. Reheat in the microwave for 1 to 2 minutes until warmed through or in a baking dish in the oven for 15 minutes at 300 degrees F.
    • Nutrition facts do not include toppings.

    Nutrition

    Serving: 1serving | Calories: 377kcal | Carbohydrates: 50g | Protein: 18g | Fat: 13g | Saturated Fat: 6g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Cholesterol: 27mg | Sodium: 781mg | Potassium: 730mg | Fiber: 10g | Sugar: 6g | Vitamin A: 1052IU | Vitamin C: 43mg | Calcium: 264mg | Iron: 4mg
    Did you make this recipe?Tag @its_a_vegworld_afterall and follow me today!

    Happy casserole eating! – Lizzie

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    Reader Interactions

    Comments

    1. Hayley Grace

      March 06, 2022 at 7:07 pm

      5 stars
      Love this recipe! Make it every week, it has become a family favor! Thank you!

      Reply
      • Lizzie Streit, MS, RDN

        March 07, 2022 at 9:05 am

        That’s great to hear! I’m so glad you and your family are enjoying it. Thanks for your 5-star review, Hayley!

        Reply

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