Fajita Chicken Casserole

With over 160+ 5-star reviews, this Chicken Fajita Casserole is the BEST healthy dinner recipe! I’ve been making this easy, healthy meal for my family for YEARS and they always ask for it. It’s so good! Think chicken fajitas, but made completely in ONE skillet and topped off with cheesy goodness. And bonus points: the whole thing can be made in just 30 minutes! With 54 grams of protein, I love this quick and easy healthy dinner idea.

Chicken Fajita Casserole – The BEST Quick Healthy Dinner!

If I could only make one meal for dinner for the rest of my life, this Chicken Fajita Casserole would be it. It’s just THAT good. Made with sliced fajita veggies, flavorful chicken (or rotisserie chicken), a smoky fajita sauce, whole wheat tortilla pieces, beans, spinach, and topped off with cheese and cilantro, the flavors are truly next-level!

And as a busy mom of 3, the fact that it comes together in a single skillet in just 30 minutes is truly life-changing. In this post I’ll show you exactly how to make this easy dinner so that you can keep the recipe in your pocket for easy, healthy dinners whenever you want! I’ve also added some tips below for saving even more time, making this recipe ahead, and ideas for storing your leftovers. You’re going to love this easy Chicken Fajita Casserole!

RELATED: 100+ Quick Healthy Dinners (30 Minutes Or Less)

Fajita Casserole Ingredients

Here are a few notes about what you’ll need for this easy weeknight recipe!

• Avocado Oil – I always love using avocado oil in dinner recipes, but any type of cooking oil works great!
• Fajita Vegetables – Sliced yellow onion and bell peppers are so delicious in this fajita casserole recipe. Feel free to use fresh, pre-cut, or frozen veggies!
• Chicken – This recipe calls for chicken breast that’s cooked in the skillet. However, feel free to use leftover cooked chicken or rotisserie chicken instead (see notes below).
• Tortillas – Whole wheat tortillas, flour tortillas, corn tortillas, gluten-free tortillas, or low-carb tortillas (opens in a new tab) are all great options. You can also use cooked rice or cauliflower rice!
• Tomato Sauce + Salsa – A mixture of tomato sauce and salsa add flavor and bring this casserole together.
• Fajita Seasoning – The fajita seasoning is made up of smoked paprika, cumin, chili powder, salt, and pepper. You can also use store-bought fajita seasoning (opens in a new tab) or taco seasoning, too!
• Beans – Cooked or canned black beans (or red beans) are so delicious and add tons of nutrients!
• Spinach – I like to add spinach to this casserole recipe, as it adds tons of nutrients and cooks down perfectly. You won’t even know it’s there! However, you can always omit the spinach or chop it up before throwing it in the pan.
• Cheese – Add as much cheese as you want! You can mix the cheese into the casserole or simply top it off for a delicious, cheesy, melty layer.
• Toppings – Add fresh cilantro and crushed red pepper to really bring this recipe to life!

How to Make Chicken Fajita Casserole

Making a healthy Chicken Fajita Casserole is so easy! Here’s how to put this recipe together in just 30 minutes:

1. Cook the fajita vegetables in an oven-safe skillet (opens in a new tab) with oil, then set aside.
2. Cook the chicken and garlic.
3. Mix the sauce, salsa, and fajita seasoning together.
4. Add half of the mixture in with the chicken and continue cooking.
5. Add the fajita veggies back in along with beans, spinach, tortilla pieces, and the rest of the sauce mixture.
6. Remove from heat, top with cheese and cilantro, and place in the oven.
7. Bake until the cheese melts, then add your favorite toppings and enjoy!

Chicken Fajita Bake Tips

Want to save even more time making this Chicken Fajita Casserole? Here’s how!

• Use pre-cut or even frozen fajita veggies to save time!
• Make this casserole with rotisserie chicken (or leftover cooked chicken). Simply heat up the chicken in the pan (instead of cooking the chicken breast) and add in the sauce like you normally would until it’s warm! Then continue with the rest of the steps.
• Cut the tortilla up while other ingredients are cooking.
• Have your ingredients measured and ready to go in advance!

You’ll Also Love: Instant Pot Shredded Chicken

How to Make this Chicken Fajita Casserole Recipe

Make this Chicken Fajita Casserole recipe ahead of time for easy dinners on busy weeknights! To make ahead of time (or meal prep):

1. Cook the vegetables, chicken, sauce mixture, beans, and spinach according to the recipe card directions.
2. Let cool completely, then refrigerate for 30 minutes.
3. Mix in the whole wheat tortilla pieces.
4. Transfer the casserole mixture into an oven-safe airtight container or airtight casserole dish. (opens in a new tab)
5. Top with shredded cheese and cilantro.
6. Add the airtight lid and store in the refrigerator for up to 3 days.
7. When ready to eat, simply place it in the oven for about 15-20 minutes (or until the cheese melts and everything is warm)!

Another option is to heat it up in the microwave (if using meal prep containers instead). You can always just cook the entire recipe according to directions and then reheat throughout the week, too!

Storing Fajita Casserole

This Chicken Fajita Casserole recipe can be stored in an airtight container in the refrigerator for 3-4 days or the freezer for up to 3 months!

To reheat, simply place it in the oven or microwave and heat up until everything is evenly warm.

How to Pair Fajita Chicken Casserole (Side Dish Ideas)

• Tortilla Chips & Salsa
• Roasted Sweet Potato Black Bean Salad
• Southwest Salad Dressing
• Spanish Rice & Beans
• Creamy Avocado Lime Dressing
• Easy Instant Pot Brown Rice
• Chili Mango Zesty Quinoa Salad

More Like Fajita Casserole

• Baked Mahi Mahi Tacos
• The BEST Chicken Fajita Tacos
• Spicy Southwest Butternut Squash Casserole
• Sheet Pan Shrimp Fajitas
• Spinach & Mushroom Vegetarian Lasagna
• Taco Bowl Recipe
• Creamy Healthy Chicken Enchilada Skillet

Did you make this recipe? Be sure to give it a rating below and tag your photos  @jar.of.lemons! (opens in a new tab)