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    Home » Side Dishes

    Fajita Peppers and Onions

    Published: Sep 28, 2021 · Modified: Sep 8, 2022 by Mariah Mandile

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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 make a small commission if you choose to purchase through qualifying links.

    Jump to:
    • 🍴Ingredient Notes
    • 🍴Step by Step Instructions
    • Helpful Tips
    • What to serve with Peppers and Onions
    • How to store leftovers
    • Recipe
    • 💬 Reviews

    🍴Ingredient Notes

    Overhead shot of ingredients.
    • Sliced Bell Peppers - Any bell peppers will work for this recipe! I like using a mix of all the colors.
    • Sweet Onion - You'll need 1-2 onions depending on how big they are.
    • Olive Oil - You can sub with Avocado Oil.
    • Spices - 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

    1. 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.
    2. 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.)
    3. Serve hot, enjoy!
    All ingredients in pan before cooking.
    Overhead shot of cooked peppers and onions in pan.

    Helpful Tips

    • If you don't have a cast iron skillet, you can also use a large casserole dish!
    • For quicker preparation, use a packet of taco seasoning instead of individual spices.
    • You can stir the mixture together in the cast iron skillet or a bowl if it's easier.
    • It's optional, but I like stirring the mixture after about 20 minutes of baking to make sure it's not sticking at the bottom of the pan.
    • If you're using a cast iron skillet, make sure it's seasoned!

    What to serve with Peppers and Onions

    • My favorite way to serve this dish is fajita style with grilled chicken or steak. I slice the meat thinly and serve on the side with gluten-free tortillas.
    • If you're vegetarian, you can serve the vegetables with Cilantro Rice.
    • It's also great if you want to make a burrito bowl! Stuff your bowl with whatever you have on hand. (Protein/grains/vegetables.)
    • Other great pairings - fresh lime juice, avocado, cilantro.
    Wooden spoon scooping out peppers and onions.

    How to store leftovers

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

    More recipes you'll love!

    • Steak Fajita Tacos
    • Whole30 Pepper Nachos
    • Baked Fajita Steak (Whole30)
    • Spicy Chicken Tacos with Grilled Corn

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

    Recipe

    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 mins
    Cook Time 30 mins
    Total Time 45 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!

    More Side Dishes

    • Lemon Orzo Salad
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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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