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    Home » Side Dishes

    Easy Recipe for Fajita Style Peppers and Onions

    Published: Sep 28, 2021 · Modified: Jun 25, 2023 by Mariah Knight

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    Fajita Peppers and Onions is one of the easiest dishes you'll ever make! Once the vegetables are prepared, just toss them in the spices, and bake right in a cast iron skillet. It's great for fajitas, tacos, burrito bowls, or even meal prep!

    Close up picture of peppers and onions in cast iron skillet.

    Disclaimer: Some of the links in this post are affiliate links, which means I earn a commission if you choose to purchase through qualifying links.

    Jump to:
    • Why You'll Love This Recipe
    • What are Fajitas?
    • 🍴Ingredient Notes
    • 🍴Step by Step Instructions
    • Stovetop Instructions
    • Helpful Tips
    • Serving Suggestions
    • How to store leftovers
    • Recipe Card
    • Want more recipes?
    • 💬 Reviews

    Why You'll Love This Recipe

    Move over Chipotle! You can make delicious fajita style peppers and onions at home for a quick weeknight meal! Just follow this simple step by step recipe and you'll have an easy side dish for any Mexican Fiesta!

    Healthy

    The best part about this recipe is that it's made fresh vegetables and some simple seasonings you probably have in your kitchen right now!

    It's an extremely versatile dish that you can serve with a variety of meals and easily customize for dietary restrictions.

    Easy

    It doesn't get much easier than mixing all the ingredients together and baking in a large cast iron skillet! (You can also cook them on the stovetop in any nonstick skillet.)

    What are Fajitas?

    Fajitas are a Mexican dish that typically consists of peppers, onions, and some type of protein like chicken, steak, or shrimp that is served with warm tortillas. For more information, check out my Steak Fajita recipe!

    🍴Ingredient Notes

    Overhead shot of ingredients.
    • Sweet Bell Peppers - You can use red bell peppers, green bell peppers, yellow bell peppers, or orange bell peppers! I like using a variety of all the colors.
    • Sweet Onion - You'll need 1-2 onions depending on how big they are. You can also add in a red onion too!
    • Olive Oil - You can sub with avocado oil or coconut oil.
    • Homemade Fajita Seasoning - Chili Powder, Cumin, Salt, Cayenne Pepper, Garlic Powder. If you don't have these individual spices, you can also use a packet of taco seasoning or a couple teaspoons of a Mexican style spice blend.

    🍴Step by Step Instructions

    Step 1: Prepare Vegetables

    Start by adding the thinly sliced peppers and onions into a cast iron skillet or large bowl. Pour over all the spices and olive oil and stir well.

    All ingredients in pan before cooking.

    Step 2: Bake Vegetables

    Bake the peppers and onions in a large cast iron skillet or casserole dish for about 30-40 minutes at 350 degrees, or until vegetables are tender. (Stir halfway through.)

    Overhead shot of cooked peppers and onions in pan.

    Stovetop Instructions

    Add the thin slices of seasoned vegetables into a large skillet. Cook on medium-high heat for about 30 minutes covered. Stir occasionally to prevent the vegetables from sticking and burning.

    Helpful Tips

    • If you don't have a large cast iron skillet, you can also use a large casserole dish to bake in the oven.
    • For quicker preparation, use a packet of taco seasoning instead of individual spices.
    • It's easier if you stir the veggies and spices together in a large bowl before adding into the skillet.
    • For best results, stir the vegetable mixture halfway through baking to ensure even cooking and to prevent the vegetables from burning at the bottom of the pan.
    • If you're using a cast iron skillet, make sure it's seasoned!

    Serving Suggestions

    Fajita Style

    My favorite way to serve this dish is with grilled chicken or steak. After cooking, I thinly slice the meat and serve on the side with gluten-free tortillas. (Corn tortillas work too!)

    Vegetarian or Vegan

    If you're vegetarian or vegan, you can serve the vegetables with Cilantro Rice, refried beans, guacamole, black beans, or Mexican rice!

    Burrito Bowls

    To make Chipotle style burrito bowls, serve with seasoned chicken or steak, cilantro rice, black beans, salsa, guacamole, and dairy-free feta!

    Other great toppings - fresh lime juice, avocado, sliced jalapenos, hot sauce, and chopped cilantro.

    Wooden spoon scooping out peppers and onions.

    How to store leftovers

    If you have leftovers, they can easily be stored in an airtight container in the refrigerator for up to 5 days. (Glass containers are my personal favorite!)

    More Mexican recipes you'll love!

    • Steak fajita tacos on a parchment paper lined baking sheet.
      Steak Fajita Tacos
    • Pepper nachos on a baking sheet.
      Whole30 Pepper Nachos
    • Close up picture of baked fajita steak in a cast iron skillet.
      Baked Fajita Steak (Whole30)
    • Close up picture of a spicy chicken taco.
      Spicy Chicken Tacos with Grilled Corn

    After you make these Fajita Peppers and Onions, make sure to leave a comment & rate the recipe!

    Recipe Card

    Close up picture of peppers and onions in cast iron skillet.

    Fajita Peppers and Onions

    Whole30 Baked Peppers and Onions is one of the easiest dishes you'll ever make! Once the vegetables are prepared, just toss them in the spices, and bake right in a cast iron skillet. It's great for fajitas, burrito bowls, or even meal prep!
    5 from 1 vote
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    Prep Time 15 minutes mins
    Cook Time 30 minutes mins
    Total Time 45 minutes mins
    Course Side Dish
    Cuisine Mexican
    Servings 3
    Calories 176 kcal

    Equipment

    • 12" Cast Iron Skillet

    Ingredients
      

    • 6 Cups Sliced Bell Peppers
    • 3-4 Cups Sliced Sweet Onion
    • 1 Tablespoon Olive Oil You can sub with Avocado Oil.
    • 1 Teaspoon Chili Powder
    • 1 Teaspoon Cumin
    • 1 Teaspoon Salt
    • ½ Teaspoon Cayenne Pepper
    • ½ Teaspoon Garlic Powder

    Instructions
     

    • Start by adding sliced peppers and onions into the cast iron skillet or a bowl. (If it's easier to stir.) Pour over all the spices and olive oil, and stir well.
    • Bake the peppers and onions in the cast iron skillet for about 30 minutes at 350 degrees, or until vegetables are tender. (Stir halfway through.)
    • Serve hot, enjoy!

    Nutrition

    Serving: 1ServingCalories: 176kcalCarbohydrates: 27gProtein: 4gFat: 6gSaturated Fat: 1gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gSodium: 808mgPotassium: 798mgFiber: 8gSugar: 18gVitamin A: 9676IUVitamin C: 386mgCalcium: 53mgIron: 2mg
    Keywords baked peppers and onions, whole30 fajitas, whole30 peppers and onions
    Did you make this recipe?Tag @freshwaterpeaches on Instagram!

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    Reader Interactions

    Comments

    1. Shari

      January 03, 2022 at 8:40 pm

      5 stars
      So easy to make!! I served it with rice, chicken, and taco shells.

      Reply
      • Mariah Mandile

        January 04, 2022 at 10:28 am

        Yayy! Sounds delicious. (:

        Reply

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    I am a food photographer and recipe developer based in Connecticut. I love all things gut health, clean living, and I have a slight obsession with chocolate! Here you'll find simple and easy to make gluten-free, dairy-free recipes that your whole family will love!

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