Caramelized Onion, Spinach, and Avocado Quesadilla

It’s not every day I show you a quesadilla. In fact…I’ve never shown you a quesadilla. Why haven’t I shown you a quesadilla? There are no reasons.

Caramelized Onion, Spinach, and Avocado Quesadilla #vegetarian #healthy #recipe


This crispy-on-the-outside-smoosh-on-the-inside quesadilla is a souped up version of your childhood favorite. It’s all grown up with rich caramelized onions, Vitamin-ed out with spinach, and a real tear-jerking dream boat with thick slices of avocado.

Caramelized onions are my love language. 

Caramelized Onion, Spinach, and Avocado Quesadilla

I want them on all the foodstuffs. I can neither confirm nor deny my burning desire to eat caramelized onions on ice cream. They may take light years to make, but they are worth their weight in gold. Plus you can watch an entire re-run of Gilmore Girls while letting your onions become fancy. It’s a low-maintenance method for putting the artisan in your tortilla.

Caramelized Onion, Spinach, and Avocado Quesadilla

I know what you’re thinking. Gluten. Gluten-y glutenous tortillas. We don’t really do gluten here, like ever. But never fear: if you’re gluten-averse,  simply use your favorite gluten-free tortillas for this recipe. Or replace the tortilla with caramelized onions. Totally comparable substitution.

Caramelized Onion, Spinach, and Avocado Quesadilla #vegetarian #healthy #recipe

Get your cheese on!

Caramelized Onion, Spinach, and Avocado Quesadilla #vegetarian #healthy #recipe

Caramelized Onion Spinach Avocado Quesadilla

Course: Main Course
Prep Time: 15 minutes
Cook Time: 1 hour
Total Time: 1 hour 15 minutes
Servings: 4 quesadillas
Author: Julia


  • 3 tablespoons grapeseed oil or olive oil
  • 2 large yellow onions thinly sliced
  • 1/2 teaspoon sea salt
  • 5 ounces baby spinach
  • 2 cups monterey jack cheese grated
  • 2 avocados peeled and sliced
  • 4 large flour tortillas


  1. Add the oil to a large sauté pan over medium heat. Add the onions and salt and cook, stirring occasionally, until the onions are soft and deep golden brown, about 30 to 40 minutes. (If the sides of the onions begin cooking too fast, lower the heat to medium-low, add a little more oil, and stir. Your goal is to have the onion slices cook as uniformly as possible.) Remove the onions from the pan and place them in a bowl.

  2. In the same sauté pan over low heat, add the spinach and cook, stirring frequently, until wilted, about 2 minutes. Remove from heat and transfer the spinach to another bowl, then carefully wipe the pan dry with a paper towel.

  3. Return the pan to the stove and increase the heat to medium-low. Lay one tortilla flat in the pan. Evenly sprinkle 1/2 cup of cheese over the top. To the bottom half of the tortilla, add 1/4 of the caramelized onions, followed by 1/4 of the wilted spinach. Heat until the cheese melts and the tortilla is browned and crispy.

  4. Add the avocado slices (about 1/2 of an avocado per quesadilla), and immediately fold the tortilla in half, onto itself, and flip it over. Continue cooking for about 30 seconds or until warmed through.

  5. Using a spatula, transfer the quesadilla to a cutting board. Cut into fourths. Repeat this process with the remaining ingredients and serve with your favorite salsa or cilantro pesto.

Recipe for Caramelized Onion, Spinach, and Avocado Quesadilla originally published on Oh My Veggies.


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  1. Taylor @ Food Faith Fitness

    Caramelized onions are also my love language! I think we need a girls night where we eat them on ice cream and drink wine. Good idea? Yes.
    P.s Did you know that they FREEZE SO GOOD! So you can eat them ALL THE TIME. best.
    This quesadilla? Yes. I love them…and avocados are my 2nd love language. pinned!

  2. Baby June

    I adore caramelized onions too! They’re like the ultimate vegan pizza topping, quesadilla filling, etc…I’ll have to try this variation soon! 🙂

    1. Julia Post author

      Oh yes. There will be no ‘dilla-ing without the fancy pants on 😉 Okay, truth: I ate this thing after a mountain bike ride and I was still wearing my padded shorts and there may have been a lot of sweat involved. But that’s neither here nor there.. 😉

  3. Isadora

    I will definitely be replacing the tortilla with caramelized onions, that is a genus idea, haha! I have a special place in my heart for quesadillas and an even more special place for quesadillas that are dressed up with delicious ingredients like avocado, spinach, and caramelized onions 🙂

    1. Julia Post author

      Seriously! Sign me up for a bowl of caramelized onions, spinach, cheese and avo! Food don’t get much better than that! 😉

    1. Julia Post author

      Same here! It’s an awful problem to have 😉 I’m all about over-shooting when it comes to sauteing a batch of onions

    1. Julia Post author

      haha! Now that you mention it, I do dream about quesadillas from time to time… Glad you like the ‘dilla, Kelli!

    1. Julia Post author

      Hmmm…now that I think about it, selling fancy quesadillas over the internet could be a lucrative enterprise…but for you, my dear, I deliver for free 😀

  4. Joanne

    I speak in caramelized onion tongues also! I feel like we should create our own caramelized onion-based society. Think of how happy our bellies would be.

  5. Helen

    Thanks for the recipe! Made these the other night and they were great… lots of cheese of course 😉

  6. Michelle Vincent

    I totally agree caramelized onions are my love language….I would add garlic to it..omg love avocados

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  13. Susan Soroka

    Not sure where I found this recipe the very first time, but it is a winner for a meatless meal! I’ve made it multiple timesand each time is so tasty! I think the first time I forgot the avocado, and it was still delicious! So glad to see the recipe again, as it reminds me I need to make this again!!!

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